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Re: Integrated perc 5/i

From: tyrrill_ed(at)emc(dot)com
To: <miki(at)epoch(dot)co(dot)il>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Integrated perc 5/i
Date: 2007-08-16 17:30:11
Message-ID: 5C7C0B0734F87445AFC8B63EDCC4901E015717A7@CORPUSMX60C.corp.emc.com (view raw or flat)
Thread:
Lists: pgsql-performance
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

-- 
--------------------------------------------------
Michael Ben-Nes - Internet Consultant and  Director. 
http://www.epoch.co.il - weaving the Net.
Cellular: 054-4848113
-------------------------------------------------- 

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