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@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx]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@xxxxxxxxxx on behalf of kurt.wagner@xxxxxxx Sent: Thu 5/20/2004 8:07 AM To: redhat-list@xxxxxxxxxx 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@xxxxxxxxxxxxxxx] Sent: Thursday, May 20, 2004 8:03 AM To: redhat-list@xxxxxxxxxx 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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