[Ocfs2-users] OCFS2 + ISCSI SAN slowdown

[Sunil Mushran]

That's a poor workload for a clustered file system because it has
to master/take clustered locks for each inode. Actually multiple
locks per inode. Those locks are used once and then freed. A local
fs only takes a read hit.

Loebbert.C at eplan.de wrote:
> Hi Guy,
>
> if you have serveral OCFS2 partitions on the same storage and only one of them is slow, then I would say it is not an OCFS2 problem. I could imagine that your files could be the reason of the performance problem. I encounter the same behavior when I copy a lot of really small files (<1KB). Copying of 30GB will take up to 10 hours! Copying the same files inside a ReiserFS partition (on the same storage) will just take 1,5-2 hours.
>
> Best regards,
> Christian
>
> -----Ursprüngliche Nachricht-----
> Von: ocfs2-users-bounces at oss.oracle.com [mailto:ocfs2-users-bounces at oss.oracle.com] Im Auftrag von Guy
> Gesendet: Donnerstag, 18. Februar 2010 04:55
> An: ocfs2-users at oss.oracle.com
> Betreff: [Ocfs2-users] OCFS2 + ISCSI SAN slowdown
>
> Hi,
>
> We've got an ISCSI target on a SAN run by our hosting company. We've
> got 3 OCFS2 partitions on it and one of them has suddenly become very
> slow.
> What can I do to check whether this is an OCFS2 problem or a problem
> with the SAN?
>
> The hosting company have said they've had other complaints about slow
> I/O with the SAN, but I'd like to rule out OCFS2 at the problem.
>
> I'm running Ubuntu Karmic which I believe includes OCFS2 1.4.4?
>
> Thanks
> Guy
>
>