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Add support for devid and phys_path keys in vdev disk labels

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This is foundational work for ZED.

Updates a leaf vdev's persistent device strings on Linux platform

* only applies for a dedicated leaf vdev (aka whole disk)
* updated during pool create|add|attach|import
* used for matching device matching during auto-{online,expand,replace}
* stored in a leaf disk config label (i.e. alongside 'path' NVP)
* can opt-out using env var ZFS_VDEV_DEVID_OPT_OUT=YES

Some examples:

    path: '/dev/sdb1'
    devid: 'scsi-350000394a8ca4fbc-part1'
    phys_path: 'pci-0000:04:00.0-sas-0x50000394a8ca4fbf-lun-0'

    path: '/dev/mapper/mpatha'
    devid: 'dm-uuid-mpath-35000c5006304de3f'

Signed-off-by: Don Brady <don.brady@intel.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2856
Closes #3978
Closes #4416
This commit is contained in:
Don Brady
2016-03-14 10:04:21 -06:00
committed by Brian Behlendorf
parent bebd73f2c3
commit 39fc0cb557
11 changed files with 476 additions and 163 deletions
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man/man8/zpool.8
+11
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@@ -2603,6 +2603,17 @@ Cause \fBzpool\fR subcommands to follow links for vdev names by default. This b
.B "ZPOOL_VDEV_NAME_PATH"
Cause \fBzpool\fR subcommands to output full vdev path names by default. This
behavior is identical to the \fBzpool status -p\fR command line option.
.TP
.B "ZFS_VDEV_DEVID_OPT_OUT"
Older ZFS on Linux implementations had issues when attempting to display pool
config VDEV names if a "devid" NVP value is present in the pool's config.
For example, a pool that originated on illumos platform would have a devid
value in the config and \fBzpool status\fR would fail when listing the config.
This would also be true for future Linux based pools.
A pool can be stripped of any "devid" values on import or prevented from adding
them on \fBzpool create\fR or \fBzpool add\fR by setting ZFS_VDEV_DEVID_OPT_OUT.
.SH SEE ALSO
.sp