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cefef28e98
Add ability to generate disk names that contain both a slot number and a lun number in order to support multi-actuator SAS hard drives with multiple luns. Also add the ability to zero pad slot numbers to a desired digit length for easier sorting. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Matthew Heller <matthew.f.heller@accre.vanderbilt.edu> Closes #16603
258 lines
6.9 KiB
Groff
258 lines
6.9 KiB
Groff
.\"
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.\" This file and its contents are supplied under the terms of the
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.\" Common Development and Distribution License ("CDDL"), version 1.0.
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.\" You may only use this file in accordance with the terms of version
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.\" 1.0 of the CDDL.
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.\"
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.\" A full copy of the text of the CDDL should have accompanied this
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.\" source. A copy of the CDDL is also available via the Internet at
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.\" http://www.illumos.org/license/CDDL.
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.\"
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.Dd May 26, 2021
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.Dt VDEV_ID.CONF 5
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.Os
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.
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.Sh NAME
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.Nm vdev_id.conf
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.Nd configuration file for vdev_id(8)
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.Sh DESCRIPTION
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.Nm
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is the configuration file for
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.Xr vdev_id 8 .
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It controls the default behavior of
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.Xr 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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.Nm
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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.
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Any line not beginning with a recognized keyword is ignored.
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Comments may optionally begin with a hash character.
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.Pp
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The following keywords and values are used.
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.Bl -tag -width "-h"
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.It Sy alias Ar name Ar devlink
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Maps a device link in the
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.Pa /dev
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directory hierarchy to a new device name.
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The udev rule defining the device link must have run prior to
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.Xr 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.
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For example, one might name drives in a JBOD with the
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.Sy sas_direct
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topology while naming an internal L2ARC device with an alias.
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.Pp
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.Ar name
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is the name of the link to the device that will by created under
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.Pa /dev/disk/by-vdev .
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.Pp
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.Ar devlink
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is the name of the device link that has already been
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defined by udev.
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This may be an absolute path or the base filename.
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.
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.It Sy channel [ Ns Ar pci_slot ] Ar port Ar 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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.
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.It Sy enclosure_symlinks Sy yes Ns | Ns Sy no
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Additionally create
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.Pa /dev/by-enclosure
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symlinks to the disk enclosure
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.Em sg
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devices using the naming scheme from
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.Pa vdev_id.conf .
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.Sy enclosure_symlinks
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is only allowed for
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.Sy sas_direct
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mode.
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.
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.It Sy enclosure_symlinks_prefix Ar prefix
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Specify the prefix for the enclosure symlinks in the form
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.Pa /dev/by-enclosure/ Ns Ao Ar prefix Ac Ns - Ns Ao Ar channel Ac Ns Aq Ar num
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.Pp
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Defaults to
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.Dq Em enc .
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.
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.It Sy slot Ar prefix Ar new Op Ar 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.
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If the
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.Ar channel
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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.
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The first-specified
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.Ar slot
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rule that can match a slot takes precedence.
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Therefore a channel-specific mapping for a given slot should generally appear
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before a generic mapping for the same slot.
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In this way a custom mapping may be applied to a particular channel
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and a default mapping applied to the others.
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.
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.It Sy zpad_slot Ar digits
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Pad slot numbers with zeros to make them
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.Ar digits
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long, which can help to make disk names a consistent length and easier to sort.
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.
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.It Sy multipath Sy yes Ns | Ns Sy no
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Specifies whether
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.Xr vdev_id 8
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will handle only dm-multipath devices.
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If set to
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.Sy yes
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then
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.Xr vdev_id 8
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will examine the first running component disk of a dm-multipath
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device as provided by the driver command to determine the physical path.
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.
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.It Sy topology Sy sas_direct Ns | Ns Sy sas_switch Ns | Ns Sy scsi
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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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.Bl -tag -compact -width "sas_direct and scsi"
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.It Sy sas_direct No and Sy scsi
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channels are uniquely identified by a PCI slot and HBA port number
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.It Sy sas_switch
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channels are uniquely identified by a SAS switch port number
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.El
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.
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.It Sy phys_per_port Ar 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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.Xr 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.
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The default is
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.Sy 4 .
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.
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.It Sy slot Sy bay Ns | Ns Sy phy Ns | Ns Sy port Ns | Ns Sy id Ns | Ns Sy lun Ns | Ns Sy bay_lun Ns | Ns Sy ses
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Specifies from which element of a SAS identifier the slot number is
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taken.
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The default is
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.Sy bay :
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.Bl -tag -compact -width "port"
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.It Sy bay
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read the slot number from the bay identifier.
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.It Sy phy
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read the slot number from the phy identifier.
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.It Sy port
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use the SAS port as the slot number.
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.It Sy id
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use the scsi id as the slot number.
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.It Sy lun
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use the scsi lun as the slot number.
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.It Sy bay_lun
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read the slot number from the bay identifier and append the lun number.
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Useful for multi-lun multi-actuator hard drives.
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.It Sy ses
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use the SCSI Enclosure Services (SES) enclosure device slot number,
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as reported by
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.Xr sg_ses 8 .
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Intended for use only on systems where
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.Sy bay
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is unsupported,
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noting that
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.Sy port
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and
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.Sy id
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may be unstable across disk replacement.
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.El
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.El
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.
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.Sh FILES
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.Bl -tag -width "-v v"
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.It Pa /etc/zfs/vdev_id.conf
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The configuration file for
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.Xr vdev_id 8 .
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.El
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.
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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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.Bd -literal -compact -offset Ds
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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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slot bay
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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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.Ed
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.Pp
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A SAS-switch topology.
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Note, that the
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.Ar channel
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keyword takes only two arguments in this example:
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.Bd -literal -compact -offset Ds
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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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.Ed
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.Pp
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A multipath configuration.
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Note that channel names have multiple definitions - one per physical path:
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.Bd -literal -compact -offset Ds
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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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.Ed
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.Pp
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A configuration with enclosure_symlinks enabled:
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.Bd -literal -compact -offset Ds
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multipath yes
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enclosure_symlinks yes
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# PCI_ID HBA PORT CHANNEL NAME
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channel 05:00.0 1 U
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channel 05:00.0 0 L
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channel 06:00.0 1 U
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channel 06:00.0 0 L
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.Ed
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In addition to the disks symlinks, this configuration will create:
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.Bd -literal -compact -offset Ds
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/dev/by-enclosure/enc-L0
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/dev/by-enclosure/enc-L1
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/dev/by-enclosure/enc-U0
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/dev/by-enclosure/enc-U1
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.Ed
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.Pp
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A configuration using device link aliases:
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.Bd -literal -compact -offset Ds
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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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.Ed
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.
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.Sh SEE ALSO
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.Xr vdev_id 8
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