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Re: RAID card recommendation

From: Robert Schnabel <schnabelr(at)missouri(dot)edu>
To: Jochen Erwied <jochen(at)pgsql-performance(dot)erwied(dot)eu>
Cc: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: RAID card recommendation
Date: 2009-11-24 23:49:31
Message-ID: 4B0C710B.3070507@missouri.edu (view raw or flat)
Thread:
Lists: pgsql-performance
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<br>
Jochen Erwied wrote:
<blockquote cite="mid:1193522694(dot)20091125000240(at)erwied(dot)eu" type="cite">
  <pre wrap="">Tuesday, November 24, 2009, 10:34:00 PM you wrote:

  </pre>
  <blockquote type="cite">
    <pre wrap="">Aberdeen is the builder I use.  They'll put any card in you want
(within reason) including our preference here, Areca.  Perhaps you
meant Areca?
    </pre>
  </blockquote>
  <pre wrap=""><!---->
I knew Areca only for their internal arrays (which one of our customers
uses for his 19" systems), but did not know they manufacture their own
controllers. Added the ARC-1212+BBU to my wishlist :-)</pre>
</blockquote>
<br>
For what it's worth I'm using the Adaptec 5445Z on my new server (don't
have Postgre running on it) and have been happy with it.&nbsp; For storage
on my servers I use
<a class="moz-txt-link-freetext" href="http://www.pc-pitstop.com/sas_cables_enclosures/scsase16.asp">http://www.pc-pitstop.com/sas_cables_enclosures/scsase16.asp</a> which has
an Areca ARC-8020 expander in it. With the 5445Z I use the 4 internal
ports for a fast RAID0 "working array" with 450G Seagate 15k6 drives
and the external goes to the 16 drive enclosure through the expander.&nbsp;
With 16 drives you have a lot of possibilities for configuring arrays.&nbsp;
I have another server with an Adaptec 52445 (don't have Postgre running
on it either) connected to two of the 16 drive enclosures and am happy
with it.&nbsp; I'm running Postgre on my workstation that has an Adaptec
52445 hooked up to two EnhanceBox-E8MS
(<a class="moz-txt-link-freetext" href="http://www.enhance-tech.com/products/desktop/E8_Series.html">http://www.enhance-tech.com/products/desktop/E8_Series.html</a>).&nbsp; I have
8 ST373455SS drives in my tower and 8 in the EnhanceBox so my database
is running off 16 drives in RAID5.&nbsp; Everyone complains about RAID5 but
it works for me in my situation.&nbsp; Very very rarely am I waiting on the
disks when running queries. The other EnhanceBox has 8 ST31000640SS
drives in RAID5 just for backup images.&nbsp; All 24 drives run off the
52445 and again, I've been satisfied with it.&nbsp; I've also been happy
with the Enhance Technology products.&nbsp; Sorry for being so long but just
wanted to put a plug in for the Adaptec cards and let you know about
the external options.&nbsp; The 5 series cards are a huge improvement over
the 3 series. I had a 3805 and wasn't that impressed.&nbsp; It's actually
sitting on my shelf now collecting dust.<br>
<br>
Bob<br>
<br>
<br>
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