Disk Performance - RH9 vs RHEL ES 3 (RESOLVED)

[Greg Bradner]

Do you know what's different in the kernels?


Rigler, Steve wrote:

>We just loaded the errata kernel (2.4.21-15) and the performance
>looks good.  We're seeing 160MB/s write, 345MB/s re-write, 180MB/s
>read and 240MB/s re-read on the EMC array.
>
>It looks like this has resolved our problem!
>
>-Steve
>
>-----Original Message-----
>From: redhat-list-bounces at redhat.com [mailto:redhat-list-bounces at redhat.com]On Behalf Of Rigler, Steve
>Sent: Thursday, May 20, 2004 6:28 PM
>To: General Red Hat Linux discussion list
>Subject: RE: Disk Performance - RH9 vs RHEL ES 3
>
>
>Kurt,
>
>It's a cx700.  This machine also has an LSI SATA array (SGI TP9500)
>which gets pretty dismal performance as well.  Another site we are
>working with has the cx600 and tried both RH9 and RHEL 3 and reported
>the same findings we saw.
>
>I just noticed an errata kernel available which should address this. 
>We'll try it tomorrow and post the results.
>
>-Steve
>
>
>-----Original Message-----
>From: redhat-list-bounces at redhat.com on behalf of kurt.wagner at amd.com
>Sent: Thu 5/20/2004 8:07 AM
>To: redhat-list at redhat.com
>Subject: RE: Disk Performance - RH9 vs RHEL ES 3
>
>Steve - we are about to implement the same configuration.
>What kind of EMC array?  Have you don't any performance
>tuning on the HBA?
>
>Kurt
>
>-----Original Message-----
>From: Rigler, Steve [mailto:SRigler at MarathonOil.com]
>Sent: Thursday, May 20, 2004 8:03 AM
>To: redhat-list at redhat.com
>Subject: Disk Performance - RH9 vs RHEL ES 3
>
>We are in the process of configuring an EMC array on an RHEL ES 3
>machine and are seeing disappointing performance especially when
>considering a comparison to what we see from RH9.
>
>The benchmarking tool we're using is Iozone (64K record size with
>a 4G file).  The HBA's are QLogic 2300's (2gig).
>
>On RHEL 3, we're using LVM to stripe across two luns and the write
>rate is about 79MB/s, and read is about 110MB/s.  Without striping,
>the write rate drops to about 45MB/s.
>
>With RH9, writing to a single lun (no striping), the write performance
>was about 160MB/s and read was about 100MB/s.  We haven't tried
>striping across luns with RH9 (yet).
>
>This has been confirmed at two sites, so I'm curious if anyone else
>has seen this or has any tuning suggestions.
>
>Thanks,
>Steve
>RHCE #803003335409754
>
>
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