[LU-608] port 24487 (sgpdd-survey.sh/sgpdd-survey doesn't play nice with devices specified by alias)

• Type: Bug
• Resolution: Duplicate
• Priority: Minor
• Fix Version/s: Lustre 1.8.7
• Affects Version/s: Lustre 2.1.0, Lustre 1.8.6
• Severity: 3
• Bugzilla ID: 24,487
• Assignee: Niu Yawei (Inactive)
• Reporter: Niu Yawei (Inactive)

Description

For our acceptance-small configuration we specify devices by-id instead of device name since the
device name occasionally changes. This causes a problem with sgpdd-survey.sh since sgpdd-survey
doesn't translate the alias to the device name.

== test 1: sgpdd-survey, mds, scsidevs == 15:30:35 (1301603435)
Loading modules from
/opt/cray/lustre-cray_gem_s/1.8.4_2.6.32.27_0.2.2_1.0000.5785.16.1-1.0000.25970.22.205/lib64/lustre
lnet.debug=-1
lnet.subsystem_debug=0xffb7e3ff
lnet options: ' accept=all'
=== mds === nid00035 === /dev/disk/by-id/scsi-3600a0b80005121d800001f7a4cd16b41-part1 ===
nid00035: + rslt=/tmp/sgpdd_survey size=1024 crghi=2 thrhi=2
scsidevs="/dev/disk/by-id/scsi-3600a0b80005121d800001f7a4cd16b41-part1"
/opt/cray/lustre-cray_gem_s/1.8.4_2.6.32.27_0.2.2_1.0000.5785.16.1-1.0000.25970.22.205/bin/sgpdd-survey
nid00035: Can't find SG device for /dev/disk/by-id/scsi-3600a0b80005121d800001f7a4cd16b41-part1,
testing for partition
nid00035: Can't find SG device /dev/disk/by-id/scsi-3600a0b80005121d800001f7a4cd16b41-part.

It would be nice if either sgpdd-survey or sgpdd-survey.sh would translate aliases to device names.
The attached patch modifies sgpdd-survey to do a 'readlink -f' on the device name if the device
path is something like "/dev/disk/by-*" and the device path is a symbolic link (maybe this is
redundant?).

When we define our devices by-id sgpdd-survey.sh will fail for us without this patch and it will
pass with this patch. Should also work with specifying devices by UUID, etc., but this wasn't
tested.

Issue Links

• Trackbacks: Lustre 1.8.x known issues tracker While testing against Lustre b18 branch, we would hit known bugs which were already reported in Lustre Bugzilla https://bugzilla.lustre.org/. In order to move away from relying on Bugzilla, we would create a JIRA
• Trackbacks: Changelog 1.8 {}version 1.8.7wc1{} {}Support for networks: socklnd \any kernel supported by Lustre, qswlnd Qsnet kernel modules 5.20 and later, openiblnd IbGold 1.8.2, o2iblnd OFED 1.3, 1.4.1, 1.4.2, 1.5.1, 1.5.2, 1.5.3.1 and 1.5.3.2 gmlnd GM 2.1....