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vdev_id: new slot type ses

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This extends vdev_id to support a new slot type, ses, for SCSI Enclosure
Services.  With slot type ses, the disk slot numbers are determined by
using the device slot number reported by sg_ses for the device with
matching SAS address, found by querying all available enclosures.

This is primarily of use on systems with a deficient driver omitting
support for bay_identifier in /sys/devices.  In my testing, I found that
the existing slot types of port and id were not stable across disk
replacement, so an alternative was required.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Simon Guest <simon.guest@tesujimath.org>
Closes #6956
This commit is contained in:
Simon Guest
2017-12-21 06:42:07 +13:00
committed by Tony Hutter
parent 2b8c3cb0c8
commit 41f7723e9c
2 changed files with 24 additions and 1 deletions
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man/man5/vdev_id.conf.5
+7 -1
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@@ -90,7 +90,7 @@ internally uses this value to determine which HBA or switch port a
device is connected to. The default is 4.
.TP
\fIslot\fR <bay|phy|port|id|lun>
\fIslot\fR <bay|phy|port|id|lun|ses>
Specifies from which element of a SAS identifier the slot number is
taken. The default is bay.
@@ -103,6 +103,12 @@ taken. The default is bay.
\fIid\fR - use the scsi id as the slot number.
\fIlun\fR - use the scsi lun as the slot number.
\fIses\fR - use the SCSI Enclosure Services (SES) enclosure device slot number,
as reported by
.BR sg_ses (8).
This is intended for use only on systems where \fIbay\fR is unsupported,
noting that \fIport\fR and \fIid\fR may be unstable across disk replacement.
.SH EXAMPLES
A non-multipath configuration with direct-attached SAS enclosures and an
arbitrary slot re-mapping.