[Linux-cluster] [Fwd: Re: [Iscsitarget-devel] iSCSI on Fedora Core 5 or custom]

[Brenton Rothchild]

Hello!

There has been some minor discussion on the iscsitarget-devel list
regarding the fact that the current iscsitarget code doesn't fully
implement the SCSI commands Release and Reserve, nor does it implement
persistent reserve in/out.

It was also mentioned that some cluster software, such as
MSCS (Microsoft Cluster), will possibly corrupt data.

It was then asked if GFS would depend on these unimplemented
SCSI commands, and the response from Ming Zhang (below) wasn't 100%
sure.

So, would an iSCSI target lacking Release, Reserve, and persistent
reserve in/out cause problems with GFS?

Thanks!
-Brenton

-------- Original Message --------
Subject: Re: [Iscsitarget-devel] iSCSI on Fedora Core 5 or custom
Date: Tue, 18 Apr 2006 17:16:39 -0400
From: Ming Zhang <mingz at ele.uri.edu>
Reply-To: mingz at ele.uri.edu
To: Jos Vos <jos at xos.nl>
CC: iscsitarget-devel at lists.sourceforge.net

On Tue, 2006-04-18 at 22:50 +0200, Jos Vos wrote:
> On Tue, Apr 18, 2006 at 04:21:29PM -0400, Ming Zhang wrote:
> 
> > cluster like MSCS, cluster file system mostly depends on scsi command
> > like reserve/release, persistent reserve in/out. But IET does not really
> > implement them. So there will be chance that you fail the cluster and
> > corrupt u data.
> 
> Does this also apply to the GFS and OCFS2 filesystems?

i am not 100% sure, but i remember that once a GFS guy told me that GFS
will run ok even with persistent reserve in/out support. not sure about
OCFS2.

Ming




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