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

[Thomas Lau]

May I ask how you change these parameter ?

Also, for a 90 percent read ocfs2, should I change to writeback as well?
-----Original Message-----
From: Ulf Zimmermann
Sent:  12/03/2011, 12:11  PM
To: Sunil Mushran
Cc: ocfs2-users at oss.oracle.com
Subject: Re: [Ocfs2-users] What could cause slow down betwen OCFS2 1.2.9 and 1.4.4


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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> 

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