Message-ID: <4BBF51B6.8070307@krogh.cc>
Date: Fri, 09 Apr 2010 18:11:34 +0200
From: Jesper Krogh <jesper@krogh.cc>
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To: pgsql-performance@postgresql.org
Subject: Re: 3ware vs. MegaRAID
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On 2010-04-09 17:27, Greg Smith wrote:
> Jesper Krogh wrote:
>> Can someone shed "simple" light on an extremely simple question.
>> How do you physicallly get 48 drives attached to an LSI that claims to
>> only have 2 internal and 2 external ports?
>> (the controller claims to support up to 240 drives).
>
> There are these magic boxes that add "SAS expansion", which basically 
> splits a single port so you can connect more drives to it.  An example 
> from a vendor some of the regulars on this list like is 
> http://www.aberdeeninc.com/abcatg/kitjbod-1003.htm
>
> You normally can't buy these except as part of an integrated drive 
> chassis subsystem.  If you get one that has an additional pass-through 
> port, that's how you can stack these into multiple layers and hit 
> really large numbers of disks.

I've spent quite some hours googling today. Am I totally wrong if the:
HP MSA-20/30/70 and Sun Oracle J4200's:
https://shop.sun.com/store/product/53a01251-2fce-11dc-9482-080020a9ed93
are of the same type just from "major" vendors.

That would enable me to reuse the existing server and moving to something
like Intel's X25-M 160GB disks with just a higher amount (25) in a MSA-70.

-- 
Jesper .. that's beginning to look like a decent plan.