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Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.TH vdev_id.conf 5
.SH NAME
vdev_id.conf \- Configuration file for vdev_id
.SH DESCRIPTION
.I vdev_id.conf
is the configuration file for
.BR vdev_id (8).
It controls the default behavior of
.BR vdev_id (8)
while it is mapping a disk device name to an alias.
.PP
The
.I vdev_id.conf
file uses a simple format consisting of a keyword followed by one or
more values on a single line. Any line not beginning with a recognized
keyword is ignored. Comments may optionally begin with a hash
character.
The following keywords and values are used.
vdev_id support for device link aliases Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #981
2012-11-29 23:08:37 +04:00
.TP
\fIalias\fR <name> <devlink>
Maps a device link in the /dev directory hierarchy to a new device
name. The udev rule defining the device link must have run prior to
.BR vdev_id (8).
A defined alias takes precedence over a topology-derived name, but the
two naming methods can otherwise coexist. For example, one might name
drives in a JBOD with the sas_direct topology while naming an internal
L2ARC device with an alias.
\fIname\fR - the name of the link to the device that will by created in
/dev/disk/by-vdev.
\fIdevlink\fR - the name of the device link that has already been
defined by udev. This may be an absolute path or the base filename.
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.TP
\fIchannel\fR [pci_slot] <port> <name>
Maps a physical path to a channel name (typically representing a single
disk enclosure).
Add enclosure_symlinks option to vdev_id Add an 'enclosure_symlinks' option to vdev_id.conf. This creates consistently named symlinks to the enclosure devices (/dev/sg*) based off the configuration in vdev_id.conf. The enclosure symlinks show up in /dev/by-enclosure/<prefix>-<channel><num>. The links make it make it easy to run sg_ses on a particular enclosure device. The enclosure links are created in addition to the normal /dev/disk/by-vdev links. 'enclosure_symlinks' is only valid in sas_direct configurations. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Simon Guest <simon.guest@tesujimath.org> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #8194
2018-12-15 04:27:49 +03:00
.TP
\fIenclosure_symlinks\fR <yes|no>
Additionally create /dev/by-enclosure symlinks to the disk enclosure
Fix typos in man/ Reviewed-by: Ryan Moeller <ryan@ixsystems.com> Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net> Closes #9233
2019-08-30 19:41:35 +03:00
sg devices using the naming scheme from vdev_id.conf.
Add enclosure_symlinks option to vdev_id Add an 'enclosure_symlinks' option to vdev_id.conf. This creates consistently named symlinks to the enclosure devices (/dev/sg*) based off the configuration in vdev_id.conf. The enclosure symlinks show up in /dev/by-enclosure/<prefix>-<channel><num>. The links make it make it easy to run sg_ses on a particular enclosure device. The enclosure links are created in addition to the normal /dev/disk/by-vdev links. 'enclosure_symlinks' is only valid in sas_direct configurations. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Simon Guest <simon.guest@tesujimath.org> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #8194
2018-12-15 04:27:49 +03:00
\fIenclosure_symlinks\fR is only allowed for sas_direct mode.
.TP
\fIenclosure_symlinks_prefix\fR <prefix>
Specify the prefix for the enclosure symlinks in the form of:
/dev/by-enclosure/<prefix>-<channel><num>
Defaults to "enc" if not specified.
.TP
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
\fIpci_slot\fR - specifies the PCI SLOT of the HBA
hosting the disk enclosure being mapped, as found in the output of
.BR lspci (8).
This argument is not used in sas_switch mode.
\fIport\fR - specifies the numeric identifier of the HBA or SAS switch port
connected to the disk enclosure being mapped.
\fIname\fR - specifies the name of the channel.
.TP
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
\fIslot\fR <old> <new> [channel]
Maps a disk slot number as reported by the operating system to an
alternative slot number. If the \fIchannel\fR parameter is specified
then the mapping is only applied to slots in the named channel,
otherwise the mapping is applied to all channels. The first-specified
\fIslot\fR rule that can match a slot takes precedence. Therefore a
channel-specific mapping for a given slot should generally appear before
a generic mapping for the same slot. In this way a custom mapping may
be applied to a particular channel and a default mapping applied to the
others.
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.TP
\fImultipath\fR <yes|no>
Specifies whether
.BR vdev_id (8)
will handle only dm-multipath devices. If set to "yes" then
.BR vdev_id (8)
will examine the first running component disk of a dm-multipath
device as listed by the
.BR multipath (8)
command to determine the physical path.
.TP
\fItopology\fR <sas_direct|sas_switch>
Identifies a physical topology that governs how physical paths are
mapped to channels.
\fIsas_direct\fR - in this mode a channel is uniquely identified by
a PCI slot and a HBA port number
\fIsas_switch\fR - in this mode a channel is uniquely identified by
a SAS switch port number
.TP
\fIphys_per_port\fR <num>
vdev_id support for device link aliases Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #981
2012-11-29 23:08:37 +04:00
Specifies the number of PHY devices associated with a SAS HBA port or SAS
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
switch port.
.BR vdev_id (8)
internally uses this value to determine which HBA or switch port a
device is connected to. The default is 4.
Add extra keyword 'slot' to vdev_id.conf Add new keyword 'slot' to vdev_id.conf This selects from where to get the slot number for a SAS/SATA disk Needed to enable access to the physical position of a disk in a Supermicro 2027R-AR24NV . Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #3693
2015-08-19 14:01:40 +03:00
.TP
vdev_id: new slot type ses This extends vdev_id to support a new slot type, ses, for SCSI Enclosure Services. With slot type ses, the disk slot numbers are determined by using the device slot number reported by sg_ses for the device with matching SAS address, found by querying all available enclosures. This is primarily of use on systems with a deficient driver omitting support for bay_identifier in /sys/devices. In my testing, I found that the existing slot types of port and id were not stable across disk replacement, so an alternative was required. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Simon Guest <simon.guest@tesujimath.org> Closes #6956
2017-12-20 20:42:07 +03:00
\fIslot\fR <bay|phy|port|id|lun|ses>
Add extra keyword 'slot' to vdev_id.conf Add new keyword 'slot' to vdev_id.conf This selects from where to get the slot number for a SAS/SATA disk Needed to enable access to the physical position of a disk in a Supermicro 2027R-AR24NV . Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #3693
2015-08-19 14:01:40 +03:00
Specifies from which element of a SAS identifier the slot number is
taken. The default is bay.
\fIbay\fR - read the slot number from the bay identifier.
\fIphy\fR - read the slot number from the phy identifier.
vdev_id: implement slot numbering by port id With HPE hardware and hpsa-driven SAS adapters, only a single phy is reported, but no individual per-port phys (ie. no phy* entry below port_dir), which breaks topology detection in the current sas_handler code. Instead, slot information can be derived directly from the port number. This change implements a new slot keyword "port" similar to "id" and "lun", and assumes a default phy/port of 0 if no individual phy entry can be found. It allows to use the "sas_direct" topology with current HPE Dxxxx and Apollo 45xx JBODs. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Daniel Kobras <d.kobras@science-computing.de> Closes #6484
2017-08-15 01:18:26 +03:00
\fIport\fR - use the SAS port as the slot number.
Add extra keyword 'slot' to vdev_id.conf Add new keyword 'slot' to vdev_id.conf This selects from where to get the slot number for a SAS/SATA disk Needed to enable access to the physical position of a disk in a Supermicro 2027R-AR24NV . Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #3693
2015-08-19 14:01:40 +03:00
\fIid\fR - use the scsi id as the slot number.
\fIlun\fR - use the scsi lun as the slot number.
vdev_id: new slot type ses This extends vdev_id to support a new slot type, ses, for SCSI Enclosure Services. With slot type ses, the disk slot numbers are determined by using the device slot number reported by sg_ses for the device with matching SAS address, found by querying all available enclosures. This is primarily of use on systems with a deficient driver omitting support for bay_identifier in /sys/devices. In my testing, I found that the existing slot types of port and id were not stable across disk replacement, so an alternative was required. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Simon Guest <simon.guest@tesujimath.org> Closes #6956
2017-12-20 20:42:07 +03:00
\fIses\fR - use the SCSI Enclosure Services (SES) enclosure device slot number,
as reported by
.BR sg_ses (8).
This is intended for use only on systems where \fIbay\fR is unsupported,
noting that \fIport\fR and \fIid\fR may be unstable across disk replacement.
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.SH EXAMPLES
A non-multipath configuration with direct-attached SAS enclosures and an
arbitrary slot re-mapping.
.P
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.nf
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
multipath no
topology sas_direct
phys_per_port 4
Add extra keyword 'slot' to vdev_id.conf Add new keyword 'slot' to vdev_id.conf This selects from where to get the slot number for a SAS/SATA disk Needed to enable access to the physical position of a disk in a Supermicro 2027R-AR24NV . Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #3693
2015-08-19 14:01:40 +03:00
slot bay
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
# PCI_SLOT HBA PORT CHANNEL NAME
channel 85:00.0 1 A
channel 85:00.0 0 B
channel 86:00.0 1 C
channel 86:00.0 0 D
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
# Custom mapping for Channel A
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
# Linux Mapped
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
# Slot Slot Channel
slot 1 7 A
slot 2 10 A
slot 3 3 A
slot 4 6 A
# Default mapping for B, C, and D
slot 1 4
slot 2 2
slot 3 1
slot 4 3
.fi
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.P
A SAS-switch topology. Note that the
.I channel
keyword takes only two arguments in this example.
.P
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.nf
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
topology sas_switch
# SWITCH PORT CHANNEL NAME
channel 1 A
channel 2 B
channel 3 C
channel 4 D
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.fi
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.P
A multipath configuration. Note that channel names have multiple
definitions - one per physical path.
.P
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.nf
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
multipath yes
# PCI_SLOT HBA PORT CHANNEL NAME
channel 85:00.0 1 A
channel 85:00.0 0 B
channel 86:00.0 1 A
channel 86:00.0 0 B
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.fi
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.P
Add enclosure_symlinks option to vdev_id Add an 'enclosure_symlinks' option to vdev_id.conf. This creates consistently named symlinks to the enclosure devices (/dev/sg*) based off the configuration in vdev_id.conf. The enclosure symlinks show up in /dev/by-enclosure/<prefix>-<channel><num>. The links make it make it easy to run sg_ses on a particular enclosure device. The enclosure links are created in addition to the normal /dev/disk/by-vdev links. 'enclosure_symlinks' is only valid in sas_direct configurations. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Simon Guest <simon.guest@tesujimath.org> Signed-off-by: Tony Hutter <hutter2@llnl.gov> Closes #8194
2018-12-15 04:27:49 +03:00
A configuration with enclosure_symlinks enabled.
.P
.nf
multipath yes
enclosure_symlinks yes
# PCI_ID HBA PORT CHANNEL NAME
channel 05:00.0 1 U
channel 05:00.0 0 L
channel 06:00.0 1 U
channel 06:00.0 0 L
.fi
In addition to the disks symlinks, this configuration will create:
.P
.nf
/dev/by-enclosure/enc-L0
/dev/by-enclosure/enc-L1
/dev/by-enclosure/enc-U0
/dev/by-enclosure/enc-U1
.fi
.P
vdev_id support for device link aliases Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #981
2012-11-29 23:08:37 +04:00
A configuration using device link aliases.
.P
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.nf
vdev_id support for device link aliases Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #981
2012-11-29 23:08:37 +04:00
# by-vdev
# name fully qualified or base name of device link
alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
alias d2 wwn-0x5000c5002def789e
vdev_id: support per-channel slot mappings The vdev_id udev helper currently applies slot renumbering rules to every channel (JBOD) in the system. This is too inflexible for systems with non-homogeneous storage topologies. The "slot" keyword now takes an optional third parameter which names a channel to which the mapping will apply. If the third parameter is omitted then the rule applies to all channels. The first-specified rule that can match a slot takes precedence. Therefore a channel-specific rule for a given slot should generally appear before a generic rule for the same slot number. In this way a custom slot mapping can be applied to a particular channel and a default mapping applied to the rest. Signed-off-by: Ned Bass <bass6@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2056
2014-01-14 01:32:41 +04:00
.fi
vdev_id support for device link aliases Add a vdev_id feature to map device names based on already defined udev device links. To increase the odds that vdev_id will run after the rules it depends on, increase the vdev.rules rule number from 60 to 69. With this change, vdev_id now provides functionality analogous to zpool_id and zpool_layout, paving the way to retire those tools. A defined alias takes precedence over a topology-derived name, but the two naming methods can otherwise coexist. For example, one might name drives in a JBOD with the sas_direct topology while naming an internal L2ARC device with an alias. For example, the following lines in vdev_id.conf will result in the creation of links /dev/disk/by-vdev/{d1,d2}, each pointing to the same target as the device link specified in the third field. # by-vdev # name fully qualified or base name of device link alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca alias d2 wwn-0x5000c5002def789e Also perform some minor vdev_id cleanup, such as removal of the unused -s command line option. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #981
2012-11-29 23:08:37 +04:00
.P
Add vdev_id for JBOD-friendly udev aliases vdev_id parses the file /etc/zfs/vdev_id.conf to map a physical path in a storage topology to a channel name. The channel name is combined with a disk enclosure slot number to create an alias that reflects the physical location of the drive. This is particularly helpful when it comes to tasks like replacing failed drives. Slot numbers may also be re-mapped in case the default numbering is unsatisfactory. The drive aliases will be created as symbolic links in /dev/disk/by-vdev. The only currently supported topologies are sas_direct and sas_switch: o sas_direct - a channel is uniquely identified by a PCI slot and a HBA port o sas_switch - a channel is uniquely identified by a SAS switch port A multipath mode is supported in which dm-mpath devices are handled by examining the first running component disk, as reported by 'multipath -l'. In multipath mode the configuration file should contain a channel definition with the same name for each path to a given enclosure. vdev_id can replace the existing zpool_id script on systems where the storage topology conforms to sas_direct or sas_switch. The script could be extended to support other topologies as well. The advantage of vdev_id is that it is driven by a single static input file that can be shared across multiple nodes having a common storage toplogy. zpool_id, on the other hand, requires a unique /etc/zfs/zdev.conf per node and a separate slot-mapping file. However, zpool_id provides the flexibility of using any device names that show up in /dev/disk/by-path, so it may still be needed on some systems. vdev_id's functionality subsumes that of the sas_switch_id script, and it is unlikely that anyone is using it, so sas_switch_id is removed. Finally, /dev/disk/by-vdev is added to the list of directories that 'zpool import' will scan. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #713
2012-04-21 04:32:30 +04:00
.SH FILES
.TP
.I /etc/zfs/vdev_id.conf
The configuration file for
.BR vdev_id (8).
.SH SEE ALSO
.BR vdev_id (8)
Reference in New Issue Copy Permalink