Another change we found is we used scheduler deadline, we are doing downtime tonight to change scheduler and journal mode.
Ulf Zimmermann | Senior System Architect OPENLANE, Inc | 2200 Bridge Parkway, Suite 202 Redwood City, CA 94065 | (650) 412-4042 u...@openlane.com On Mar 11, 2011, at 14:32, "Sunil Mushran" <sunil.mush...@oracle.com> wrote: > 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@oss.oracle.com >> http://oss.oracle.com/mailman/listinfo/ocfs2-users > _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-users