2650 to 220S - slow performance (fwd)

Mark Jorgensen mjorgensen at primustel.ca
Fri Aug 8 13:07:01 CDT 2003

Just an update to my old posting...
We achieved some success :)

Upgraded to kernel 2.4.21-1.1931.2.349.2.2.ent, which is from the source
rpm for RH's Enterprise 3.0 beta.
I believe the megaraid driver was 2.00.2, although comments said it was
With that default version we experienced crashing with our bonnie tests,
along the lines of:

megarid: Waiting for 36 commands to flush: iter:39000
megarid: Waiting for 36 commands to flush: iter:40000
megarid: Waiting for 36 commands to flush: iter:60000
megaraid: critical hardware error!
megaraid: reset-340608 cmd=28 <c=0 t=0 l=0>

Upped the driver to 2.00.7, which seemed to fix the crashing and we got
the following bonnie rewrite results:

- local raid1 - 31MB/S
- raid 5 with the PERC 3/DC - 42MB/S

We're doing more tests, but a lot better results than with the megaraid
1.18f driver.


---------- Forwarded message ----------
Date: Wed, 16 Jul 2003 13:03:19 -0400 (EDT)
From: Mark Jorgensen <mjorgensen at primustel.ca>
To: Linux-PowerEdge <linux-poweredge at dell.com>
Subject: 2650 to 220S - slow performance

I'd like to get some recommendations for increasing performance on our
2650 connected to a 220S.

We have the following environment:

BIOS upgraded to A13
PERC 4/Di U320:
2 X 15000RPM drives

RedHat 9 (kernel 2.4.20-8smp)

PERC 3/DC U160:
1.18f driver
1.8 firmware

14 X  10000RPM drives, RAID5
writeback, cachedio enabled.
64K stripe size

bonnie++ results show rewrite speeds for the local 2650 drives around
27MB/S and 11MB/S for the RAID5 array.

We would expect it to be much higher.

Any advice, suggestions?


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