[Ocfs2-users] What could cause slow down betwen OCFS2 1.2.9 and 1.4.4

[Sunil Mushran]

Verifying the journal mode is easy enough. Remount with data=writeback.
It can be done one node at a time.

But since you upgraded from 4.5 to 5.5, you may have to cast a wider net
considering the entire kernel also changed.

On 03/11/2011 02:22 PM, Ulf Zimmermann wrote:
> We upgraded our production database cluster (6 node) from EL4 Update 5 to EL5 Update 5, including upgrading OCFS2 from 1.2.9 to 1.4.4.
>
> We are now noticing slowdown of batch jobs in Oracle, while hotbackup runs faster. One thing we saw is that journal mode changed from write-back to ordered, as we don't specify journal mode during mount. Oracle sees this as slowdown based on higher IO latency, going from 6-8ms to 13-15ms for single block IO. Total IO throughput has dropped.
>
> Can this be caused by the journal mode being ordered?
>
> Ulf.
>
>
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users at oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users