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2957f38d78
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
78 lines
2.4 KiB
Groff
78 lines
2.4 KiB
Groff
.TH vdev_id 8
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.SH NAME
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vdev_id \- generate user-friendly names for JBOD disks
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.SH SYNOPSIS
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.LP
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.nf
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\fBvdev_id\fR <-d dev> [-c config_file] [-g sas_direct|sas_switch]
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[-m] [-p phys_per_port]
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\fBvdev_id\fR -h
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.fi
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.SH DESCRIPTION
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The \fBvdev_id\fR command is a udev helper which parses the file
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.BR /etc/zfs/vdev_id.conf (5)
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to map a physical path in a storage topology to a channel name. The
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channel name is combined with a disk enclosure slot number to create an
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alias that reflects the physical location of the drive. This is
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particularly helpful when it comes to tasks like replacing failed
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drives. Slot numbers may also be re-mapped in case the default
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numbering is unsatisfactory. The drive aliases will be created as
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symbolic links in /dev/disk/by-vdev.
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The currently supported topologies are sas_direct and sas_switch. A
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multipath mode is supported in which dm-mpath devices are handled by
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examining the first-listed running component disk as reported by the
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.BR multipath (8)
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command. In multipath mode the configuration file should contain a
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channel definition with the same name for each path to a given
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enclosure.
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.BR vdev_id
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also supports creating aliases based on existing udev links in the /dev
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hierarchy using the \fIalias\fR configuration file keyword. See the
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.BR vdev_id.conf (5)
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man page for details.
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.SH OPTIONS
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.TP
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\fB\-c\fR <config_file>
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Specifies the path to an alternate configuration file. The default is
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/etc/zfs/vdev_id.conf.
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.TP
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\fB\-d\fR <device>
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This is the only mandatory argument. Specifies the name of a device
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in /dev, i.e. "sda".
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.TP
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\fB\-g\fR <sas_direct|sas_switch>
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Identifies a physical topology that governs how physical paths are
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mapped to channels.
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\fIsas_direct\fR - in this mode a channel is uniquely identified by
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a PCI slot and a HBA port number
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\fIsas_switch\fR - in this mode a channel is uniquely identified by
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a SAS switch port number
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.TP
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\fB\-m\fR
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Specifies that
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.BR vdev_id (8)
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will handle only dm-multipath devices. If set to "yes" then
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.BR vdev_id (8)
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will examine the first running component disk of a dm-multipath
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device as listed by the
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.BR multipath (8)
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command to determine the physical path.
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.TP
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\fB\-p\fR <phys_per_port>
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Specifies the number of PHY devices associated with a SAS HBA port or SAS
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switch port.
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.BR vdev_id (8)
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internally uses this value to determine which HBA or switch port a
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device is connected to. The default is 4.
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.TP
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\fB\-h\fR
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Print a usage summary.
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.SH SEE ALSO
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.LP
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\fBvdev_id.conf\fR(5)
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