[Ocfs2-users] RHEL4 x86_64 OCFS2 10gR2 performance

[Boris Ostrovsky]

I had very similar experience, with both OCFS2 and GFS. I was running
'iozone -s 262144 -r 1k' and when I had both nodes mount the partition and
run the benchmark, the wallclock time was 3 or 4 times that of a single node
(which was comparable to ext3 performance). Each node had 256MB of memory
since I wanted to minimize (but not completely eliminate) effects of buffer
cache.

I am attaching the numbers, if anyone is interested.

-boris


Date: Wed, 8 Feb 2006 12:51:31 -0300
> From: "Marcio Costa" <marciopc at interativainternet.com.br>
> Subject: [Ocfs2-users] RHEL4 x86_64 OCFS2 10gR2 performance
> To: "ocfs2-users at oss.oracle.com" <ocfs2-users at oss.oracle.com>
> Cc: marciopc at interativainternet.com.br,
>         josue at interativainternet.com.br
> Message-ID: <20060208153800.M95583 at interativainternet.com.br>
> Content-Type: text/plain;       charset=iso-8859-1
>
> Hi,
>
> I have 2 IBM x346 eServers, both of them with 2 Qlogic HBAs (qla2340).
> They
> are connected rendundantly to a IBM DS4300 (fiber storage). I have Oracle
> 10gR2 RAC installed. RHEL4 U2 x86_64. My problem is the following:
>
> Each server works very well, if alone,ie, if the other one has not mounted
> the ocfs2 partition. But when both of them are working, the performance
> goes
> to hell.
> For example: there is a job that, when it runs on one server alone, takes
> 4
> seconds, but when I put both servers on line, it takes 3 minutes.
>
> What could it be ? Is there any conf that I could check. I was thinking
> about change the ocfs2 for other fs (gfs or other)... could it be the case
> ?
>
> Thanks in advance.
>
> Marcio Costa.
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://oss.oracle.com/pipermail/ocfs2-users/attachments/20060322/5716c561/attachment.html
-------------- next part --------------
							random	random	bkwd	record	stride
			write	rewrite	read	reread	read	write	read	rewrite	read	fwrite	frewrite fread	freread


ext3		12.5min	113718	8335	91962	186143	4345	515	9612	258904	6002	112859	7230	76225	139576
gfs		13.5min	27217	8337	50117	62312	1611	604	8233	81180	5749	33633	7958	53301	40331
ocfs2		14.5min	42102	9345	65887	92481	1210	566	8136	155370	5605	41571	8699	78925	71724

gfs(n1)		46min	21467	5159	29705	35512	348	172	808	81188	4970	32680	8039	35667	58961
gfs(n2)		48min	40046	3493	29565	25093	504	327	906	81390	456	30035	4085	24953	22493

ocfs2 (n1)	38min	26813	4375	27406	27408	367	251	892	156194	5038	49998	8882	80288	111914
ocfs2 (n2)	35.5min	22756	5330	36728	29607	673	400	907	153949	953	45964	5117	34055	40158