Re: Integrated perc 5/i

Hi Miki,

I am using a Dell 2950, and I recently switched from using RAID 5 of all
six disks to three RAID 1 pairs with the OS on the first pair, postgres
on the second except for pg_xlog, which I moved to the third pair. This
configuration change increased the insert performance of my application
by 40%. I have not tried RAID 10 so I cannot help you there. My
suggestion is test both RAID 5 and RAID 10, and report back to us what
you find.

Ed

________________________________

From: pgsql-performance-owner(at)postgresql(dot)org
[mailto:pgsql-performance-owner(at)postgresql(dot)org] On Behalf Of Michael
Ben-Nes
Sent: Thursday, August 16, 2007 1:27 AM
To: PostgreSQL Performance
Subject: [PERFORM] Integrated perc 5/i

Hi

I wanted to know if the integrated perc 5/i which come with Dell 2950
will yield maximum performance from RAID 10 ( 15K SAS ).
Or should I ask for different card ?

I read an old post that shows that RAID 10 does not work eficently under
perc 5/i
http://groups.google.com/group/pgsql.performance/browse_thread/thread/b8
5926fe6de1f6c2/38837995887b6033?lnk=st&q=perc+5%2Fi+performance&rnum=6&h
l=en#38837995887b6033

Does any one have any experience with RAID 10 & perc 5/i ?

Thanks,
Miki

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