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Correct new mandoc errors. ``` STYLE: input text line longer than 80 bytes STYLE: no blank before trailing delimiter ``` Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: szubersk <szuberskidamian@gmail.com> Closes #14148
96 lines
2.7 KiB
Groff
96 lines
2.7 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 8
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.Os
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.
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.Sh NAME
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.Nm vdev_id
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.Nd generate user-friendly names for JBOD disks
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.Sh SYNOPSIS
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.Nm
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.Fl d Ar dev
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.Fl c Ar config_file
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.Fl g Sy sas_direct Ns | Ns Sy sas_switch Ns | Ns Sy scsi
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.Fl m
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.Fl p Ar phys_per_port
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.
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.Sh DESCRIPTION
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.Nm
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is an udev helper which parses
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.Xr vdev_id.conf 5
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to map a physical path in a storage topology to a channel name.
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The channel name is combined with a disk enclosure slot number to create
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an alias that reflects the physical location of the drive.
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This is particularly helpful when it comes to tasks like replacing failed
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drives.
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Slot numbers may also be remapped in case the default numbering is
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unsatisfactory.
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The drive aliases will be created as symbolic links in
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.Pa /dev/disk/by-vdev .
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.Pp
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The currently supported topologies are
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.Sy sas_direct ,
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.Sy sas_switch ,
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and
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.Sy scsi .
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A multipath mode is supported in which dm-mpath devices are handled by
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examining the first running component disk as reported by the driver.
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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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.Pp
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.Nm
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also supports creating aliases based on existing udev links in the /dev
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hierarchy using the
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.Sy alias
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configuration file keyword.
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See
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.Xr vdev_id.conf 5
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for details.
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.
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.Sh OPTIONS
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.Bl -tag -width "-m"
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.It Fl d Ar device
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The device node to classify, like
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.Pa /dev/sda .
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.It Fl c Ar config_file
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Specifies the path to an alternate configuration file.
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The default is
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.Pa /etc/zfs/vdev_id.conf .
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.It Fl g 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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.It Fl m
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Only handle dm-multipath devices.
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If specified, examine the first running component disk of a dm-multipath
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device as provided by the driver to determine the physical path.
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.It Fl p Ar 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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.Nm
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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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.It Fl h
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Print a usage summary.
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.El
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.
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.Sh SEE ALSO
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.Xr vdev_id.conf 5
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