[Linux-cluster] fence_scsi support in multipath env in RHEL5.3

[Atif Malik]

P
-----Original Message-----
From: "Moralejo, Alfredo" <alfredo.moralejo at roche.com>

Date: Wed, 10 Jun 2009 23:33:14 
To: linux clustering<linux-cluster at redhat.com>
Subject: RE: [Linux-cluster] fence_scsi support in multipath env in RHEL5.3


Anyone is successfully using it?

I'm testing it with a clariion storage frame on RHEL 5.3, and as soon as I enable scsi_reserve, multipath starts failing and a path goes good and bad in a loop and scsi fencing fails sometimes, should I configure in a specific way multipath.conf?:

Jun 10 23:31:58 rmamseslab07 multipathd: mpath0: remaining active paths: 3
Jun 10 23:32:00 rmamseslab07 kernel: sd 1:0:0:1: reservation conflict
Jun 10 23:32:00 rmamseslab07 kernel: sd 1:0:0:1: SCSI error: return code = 0x00000018
Jun 10 23:32:00 rmamseslab07 kernel: end_request: I/O error, dev sdm, sector 79
Jun 10 23:32:00 rmamseslab07 kernel: device-mapper: multipath: Failing path 8:192.
Jun 10 23:32:00 rmamseslab07 multipathd: 8:192: mark as failed
Jun 10 23:32:00 rmamseslab07 multipathd: mpathquorum: remaining active paths: 3
Jun 10 23:32:00 rmamseslab07 multipathd: dm-10: add map (uevent)
Jun 10 23:32:00 rmamseslab07 multipathd: dm-10: devmap already registered
Jun 10 23:32:00 rmamseslab07 multipathd: sdm: emc_clariion_checker: Path healthy
Jun 10 23:32:00 rmamseslab07 multipathd: 8:192: reinstated
Jun 10 23:32:00 rmamseslab07 multipathd: mpathquorum: remaining active paths: 4
Jun 10 23:32:00 rmamseslab07 multipathd: dm-10: add map (uevent)
Jun 10 23:32:00 rmamseslab07 multipathd: dm-10: devmap already registered
Jun 10 23:32:02 rmamseslab07 multipathd: sdl: emc_clariion_checker: Path healthy
Jun 10 23:32:02 rmamseslab07 multipathd: 8:176: reinstated
Jun 10 23:32:02 rmamseslab07 multipathd: mpath0: remaining active paths: 4
Jun 10 23:32:02 rmamseslab07 multipathd: dm-9: add map (uevent)
Jun 10 23:32:02 rmamseslab07 multipathd: dm-9: devmap already registered
Jun 10 23:32:03 rmamseslab07 kernel: sd 1:0:0:0: reservation conflict
Jun 10 23:32:03 rmamseslab07 kernel: sd 1:0:0:0: SCSI error: return code = 0x00000018
Jun 10 23:32:03 rmamseslab07 kernel: end_request: I/O error, dev sdl, sector 25256
Jun 10 23:32:03 rmamseslab07 kernel: device-mapper: multipath: Failing path 8:176.
Jun 10 23:32:03 rmamseslab07 multipathd: dm-9: add map (uevent)
Jun 10 23:32:03 rmamseslab07 multipathd: dm-9: devmap already registered
Jun 10 23:32:03 rmamseslab07 multipathd: 8:176: mark as failed
Jun 10 23:32:03 rmamseslab07 multipathd: mpath0: remaining active paths: 3



-----Original Message-----
From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Ryan O'Hara
Sent: Wednesday, June 10, 2009 9:18 PM
To: linux clustering
Subject: Re: [Linux-cluster] fence_scsi support in multipath env in RHEL5.3

On Wed, Jun 10, 2009 at 02:11:21PM +0530, Rajeev P wrote:
>  I wanted to know if fence_scsi is supported in a multipath environment for
> RHEL5.3 release.

Yes, it is supported.

> In earlier releases of RHEL5 fence_scsi was not supported in a multipath
> environment for RHEL5.3 release. If I am not wrong, this was because the
> DM-MPIO driver forwarded the registration/unregistration commands on only on
> one of the physical paths of a LUN.  Ideally it should have passed the
> commands on all physical paths.
> 
> For RHEL5.3, is this issue resolved so that I can fence_scsi in multipath
> environment.
> 
> Thanks in advance.
> 
> Rajeev

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