Disk Performance - RH9 vs RHEL ES 3

[Rigler, Steve]

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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