Hi,
device-mapper: multipath: Failing path 8:32.
8:32 has failed here.
sd 2:0:0:0: SCSI error: return code = 0x00020000
error code 20000 mean the BUS is busy.
end_request: I/O error, dev sdd, sector 1976776672
device-mapper: multipath: Failing path 8:48.
and 8:48 failed because of that.
Do you know which one was supposed to fail when the RAID controller
failed ? (my guess is it is 8:32).
The alert on the storage device was (sorry for not including this earlier)
257 Critical 2009-03-11 10:38:43 ALERT:Redundant Controller Failure
Detected (Slot B)
I also found additional logs from /var/log/messages which i did not
check earlier.
Mar 11 10:32:46 multipathd: sdc: readsector0 checker reports path is down
Mar 11 10:32:46 multipathd: checker failed path 8:32 in map infortrend01
Mar 11 10:32:46 multipathd: infortrend01: remaining active paths: 1
Mar 11 10:32:46 multipathd: sdd: readsector0 checker reports path is down
Mar 11 10:32:46 multipathd: checker failed path 8:48 in map infortrend01
Mar 11 10:32:46 multipathd: infortrend01: remaining active paths: 0
Mar 11 10:32:46 multipathd: dm-0: add map (uevent)
Mar 11 10:32:46 multipathd: dm-0: devmap already registered
Mar 11 10:32:46 multipathd: dm-0: add map (uevent)
Mar 11 10:32:47 multipathd: dm-0: devmap already registered
Mar 11 10:32:47 multipathd: sdd: readsector0 checker reports path is down
So, it looks like 8:32 was the path which had the failed controller and
during the switch over multipath must have detected 8:48 as busy? if
this is right, then it must be due to the infortrend device itself.
looks like for whatever reason the other SCSI bus became busy.
sd 2:0:0:0: SCSI error: return code = 0x00020000
end_request: I/O error, dev sdd, sector 1967432880
sd 2:0:0:0: SCSI error: return code = 0x00020000
end_request: I/O error, dev sdd, sector 161647296
Iam assuming it must have been busy for a few secs during the switch
over and the multipath config doesn't wait enough for the switchover to
work.
Any advice on the below values ?
> Additionaly, I have looked at the mailing list archives & annotated conf
> files and found two options a) failback and b) no_path_retry. What would
> be the best recommended values for these on a dual controller setup like
> mine ?
>
> It would also be helpful if someone could share infotrend specific
> settings multipath settings.
TIA
Dushyanth
--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel
