2950 write performance issues
Dr. David Alan Gilbert
dell at treblig.org
Fri Jun 8 12:34:13 CDT 2007
* McDougall, Marshall (FSH) (Marshall.McDougall at gov.mb.ca) wrote:
> I have compared the RAID config, with megacli, in all cases and they are
> identical. I am running out of ideas. I would appreciate any fresh
> approaches that are offered. Hell, I'll even take old stale ones just to
> make sure I haven't missed anything :) Thanks.
I'd start with some really simple benchmarks; e.g.
hdparm -tT on the /dev/sda (not even the partition)
then I'd look at writing performance; I tend to use
dd if=/dev/zero of=abigfile bs=1024k
then start up iostat (in sysstat package) and watch the
write performance after it stabilises.
Some of the LSI controllers are very difficult to get
good performance out of; one of the controllers (not a Dell branded
one) I actually got better performance by using software RAID
but peoples experience seems to vary a lot.
-----Open up your eyes, open up your mind, open up your code -------
/ Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \
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