From: | Franck Routier <franck(dot)routier(at)axege(dot)com> |
---|---|
To: | pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
Subject: | Re: 12 disks raid setup |
Date: | 2008-02-29 14:51:45 |
Message-ID: | 1204296705.11773.51.camel@franck-gusty |
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Thread: | |
Lists: | pgsql-performance |
Hi,
my Raid controller is an Adaptec 31205 SAS/RAID controller. The battery
was an option, but I didn't know it at purchase time. So I have no
battery, but the whole system is on an UPS.
I have done quite a few tests using bonnie++, focusing on 'random seek'
results, and found out that:
1) linux md raid 10 performs better than Adaptec hardware raid in this
field (random seek) by 15%, quite consistently
2) hardware raid is better on sequential output
3) md outperforms it again when coming to sequential read, especially
with far layout option.
So in fact I think I will use md raid, but still don't know with which
layout (3x4 or 1x12).
What would you suggest as a benchmarking method ? Simply issue a few big
queries that I expect to be usual and see how long it last, or is there
a more convinient and or "scientific" method ?
Thanks,
Franck
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