Disk Performance - RH9 vs RHEL ES 3

[Rigler, Steve]

Ed,

I saw the messages on the Taroon list but didn't see any resolutions
mentioned.  Hopefully the errata kernel will fix it.

-Steve


-----Original Message-----
From: redhat-list-bounces at redhat.com on behalf of Ed Greshko
Sent: Thu 5/20/2004 8:15 AM
To: General Red Hat Linux discussion list
Subject: Re: Disk Performance - RH9 vs RHEL ES 3
 
On Thu, 2004-05-20 at 21:02, Rigler, Steve wrote:
> 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.

You may want to bring this up on the taroon list.  Disk performance has
been discussed there before.  Oh, and are you running RHELv3-U2?  

> 
> 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
-- 
"An opinion is like an asshole - everybody has one."
    - Clint Eastwood as Harry Callahan, The Dead Pool - 1988.


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