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

[Ulf Zimmermann]

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
ulf at openlane.com


On Mar 11, 2011, at 14:32, "Sunil Mushran" <sunil.mushran at 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.
>> 
>> 
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