<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.6944.0"> <TITLE>RE: Disk Performance - RH9 vs RHEL ES 3</TITLE> </HEAD> <BODY>  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@redhat.com on behalf of kurt.wagner@amd.com Sent: Thu 5/20/2004 8:07 AM To: redhat-list@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 [<A HREF="mailto:SRigler@MarathonOil.com">mailto:SRigler@MarathonOil.com</A>] Sent: Thursday, May 20, 2004 8:03 AM To: redhat-list@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 -- redhat-list mailing list unsubscribe <A HREF="mailto:redhat-list-request@redhat.com?subject=unsubscribe">mailto:redhat-list-request@redhat.com?subject=unsubscribe</A> <A HREF="https://www.redhat.com/mailman/listinfo/redhat-list">https://www.redhat.com/mailman/listinfo/redhat-list</A> -- redhat-list mailing list unsubscribe <A HREF="mailto:redhat-list-request@redhat.com?subject=unsubscribe">mailto:redhat-list-request@redhat.com?subject=unsubscribe</A> <A HREF="https://www.redhat.com/mailman/listinfo/redhat-list">https://www.redhat.com/mailman/listinfo/redhat-list</A> </BODY> </HTML>