From: Jesper Krogh <jesper@krogh.cc>
To: pgsql-performance@postgresql.org
Subject: Re: 3ware vs. MegaRAID
Date: Fri, 09 Apr 2010 18:11:34 +0200
Message-ID: <4BBF51B6.8070307@krogh.cc> (raw)
In-Reply-To: <4BBF477A.4080701@2ndquadrant.com>
References: <4BB1FAAF.7050406@wp.pl>
<4BB23254.2040109@2ndquadrant.com>
<4BBB662C.8030102@wp.pl>
<23D26E38-9852-4EB6-9DF9-FCB2EAE1EE6C@richrelevance.com>
<x2jca24673e1004072044hac4475e8g3a3fefdcda6ebefe@mail.gmail.com>
<4BBECA06.40602@krogh.cc>
<4BBF477A.4080701@2ndquadrant.com>
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.
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Subject: Re: 3ware vs. MegaRAID
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