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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
167 lines
4.6 KiB
Groff
167 lines
4.6 KiB
Groff
.TH vdev_id.conf 5
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.SH NAME
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vdev_id.conf \- Configuration file for vdev_id
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.SH DESCRIPTION
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.I vdev_id.conf
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is the configuration file for
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.BR vdev_id (8).
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It controls the default behavior of
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.BR vdev_id (8)
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while it is mapping a disk device name to an alias.
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.PP
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The
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.I vdev_id.conf
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file uses a simple format consisting of a keyword followed by one or
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more values on a single line. Any line not beginning with a recognized
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keyword is ignored. Comments may optionally begin with a hash
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character.
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The following keywords and values are used.
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.TP
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\fIalias\fR <name> <devlink>
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Maps a device link in the /dev directory hierarchy to a new device
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name. The udev rule defining the device link must have run prior to
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.BR vdev_id (8).
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A defined alias takes precedence over a topology-derived name, but the
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two naming methods can otherwise coexist. For example, one might name
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drives in a JBOD with the sas_direct topology while naming an internal
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L2ARC device with an alias.
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\fIname\fR - the name of the link to the device that will by created in
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/dev/disk/by-vdev.
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\fIdevlink\fR - the name of the device link that has already been
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defined by udev. This may be an absolute path or the base filename.
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.TP
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\fIchannel\fR [pci_slot] <port> <name>
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Maps a physical path to a channel name (typically representing a single
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disk enclosure).
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\fIpci_slot\fR - specifies the PCI SLOT of the HBA
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hosting the disk enclosure being mapped, as found in the output of
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.BR lspci (8).
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This argument is not used in sas_switch mode.
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\fIport\fR - specifies the numeric identifier of the HBA or SAS switch port
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connected to the disk enclosure being mapped.
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\fIname\fR - specifies the name of the channel.
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.TP
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\fIslot\fR <old> <new> [channel]
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Maps a disk slot number as reported by the operating system to an
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alternative slot number. If the \fIchannel\fR parameter is specified
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then the mapping is only applied to slots in the named channel,
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otherwise the mapping is applied to all channels. The first-specified
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\fIslot\fR rule that can match a slot takes precedence. Therefore a
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channel-specific mapping for a given slot should generally appear before
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a generic mapping for the same slot. In this way a custom mapping may
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be applied to a particular channel and a default mapping applied to the
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others.
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.TP
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\fImultipath\fR <yes|no>
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Specifies whether
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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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\fItopology\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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\fIphys_per_port\fR <num>
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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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.SH EXAMPLES
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A non-multipath configuration with direct-attached SAS enclosures and an
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arbitrary slot re-mapping.
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.P
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.nf
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multipath no
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topology sas_direct
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phys_per_port 4
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# PCI_SLOT HBA PORT CHANNEL NAME
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channel 85:00.0 1 A
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channel 85:00.0 0 B
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channel 86:00.0 1 C
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channel 86:00.0 0 D
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# Custom mapping for Channel A
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# Linux Mapped
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# Slot Slot Channel
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slot 1 7 A
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slot 2 10 A
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slot 3 3 A
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slot 4 6 A
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# Default mapping for B, C, and D
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slot 1 4
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slot 2 2
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slot 3 1
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slot 4 3
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.fi
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.P
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A SAS-switch topology. Note that the
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.I channel
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keyword takes only two arguments in this example.
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.P
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.nf
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topology sas_switch
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# SWITCH PORT CHANNEL NAME
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channel 1 A
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channel 2 B
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channel 3 C
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channel 4 D
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.fi
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.P
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A multipath configuration. Note that channel names have multiple
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definitions - one per physical path.
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.P
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.nf
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multipath yes
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# PCI_SLOT HBA PORT CHANNEL NAME
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channel 85:00.0 1 A
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channel 85:00.0 0 B
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channel 86:00.0 1 A
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channel 86:00.0 0 B
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.fi
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.P
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A configuration using device link aliases.
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.P
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.nf
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# by-vdev
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# name fully qualified or base name of device link
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alias d1 /dev/disk/by-id/wwn-0x5000c5002de3b9ca
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alias d2 wwn-0x5000c5002def789e
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.fi
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.P
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.SH FILES
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.TP
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.I /etc/zfs/vdev_id.conf
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The configuration file for
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.BR vdev_id (8).
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.SH SEE ALSO
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.BR vdev_id (8)
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