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From tyrrill_ed@emc.com
Subject Re: Integrated perc 5/i
Date
Msg-id 5C7C0B0734F87445AFC8B63EDCC4901E015717A7@CORPUSMX60C.corp.emc.com
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In response to Integrated perc 5/i  ("Michael Ben-Nes" <miki@epoch.co.il>)
Responses Re: Integrated perc 5/i
Re: Integrated perc 5/i
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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@postgresql.org [mailto:pgsql-performance-owner@postgresql.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/b85926fe6de1f6c2/38837995887b6033?lnk=st&q=perc+5%2Fi+performance&rnum=6&hl=en#38837995887b6033

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

Thanks,
Miki

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