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Re: [dm-devel] Multipath failover issues



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


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