Bug#700444: multipath-tools: Automatic path recovery not occurring on IBM Power with dual VIOS served disks.

[Ritesh Raj Sarraf]

On Wednesday 13 February 2013 12:12 AM, Frank Fegert wrote:
> Hello,
>
> on a IBM Power LPAR with dual virtual I/O server (VIOS) backed disk
> devices, multipath seems not to be able to recover temporarily failed
> disk paths (e.g. after one VIOS is restarted after maintenance). The
> serial console shows:

When you said temporary, are you sure when the paths recovered back?
When you thought the paths were back, were they responding to scsi commands?
You could use tools from the sg3-utils package or use the scsi_id
program to  confirm that.

>
> [  325.695570] ibmvscsi 30000003: Virtual adapter failed rc 2!
> [  325.799041] ibmvscsi 30000003: SRP_VERSION: 16.a
> [  325.799076] ibmvscsi 30000003: Partner adapter not ready
> [  325.799087] ibmvscsi 30000003: error after reset
> [  326.072253] sd 1:0:1:0: [sdb] Unhandled error code
> [  326.072271] sd 1:0:1:0: [sdb]  Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
> [  326.072281] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 04 42 23 23 00 00 08 00
> [  326.072308] end_request: I/O error, dev sdb, sector 71443235
> [  326.072321] device-mapper: multipath: Failing path 8:16.
> [  330.538142] sd 1:0:1:0: [sdb] Unhandled error code
> [  330.538157] sd 1:0:1:0: [sdb]  Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
> [  330.538165] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
> [  330.538183] end_request: I/O error, dev sdb, sector 0
> [  335.538861] sd 1:0:1:0: [sdb] Unhandled error code
> [  335.538876] sd 1:0:1:0: [sdb]  Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
> [  335.538884] sd 1:0:1:0: [sdb] CDB: Read(10): 28 00 00 00 00 00 00 00 08 00
> [  335.538902] end_request: I/O error, dev sdb, sector 0
> ...
> ... loops forever ...


That could very well be the messages triggered by the multipath checkerloop.

>
> Any ideas where this may be caused and/or could be resolved?
>
> Thanks & best regards,
>
> Frank Fegert
>
>
> -- Package-specific info:
> Contents of /etc/multipath.conf:
> defaults {
>         getuid_callout  "/lib/udev/scsi_id -g -u -d /dev/%n"
>         no_path_retry  10
>         user_friendly_names yes
> }
>

Any good reasons for using "no_path_retry 10" ???

-- 
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."


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