From: Greg Smith <greg@2ndquadrant.com>
To: Jesper Krogh <jesper@krogh.cc>
Cc: pgsql-performance@postgresql.org
Subject: Re: 3ware vs. MegaRAID
Date: Fri, 09 Apr 2010 11:27:54 -0400
Message-ID: <4BBF477A.4080701@2ndquadrant.com> (raw)
In-Reply-To: <4BBECA06.40602@krogh.cc>
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>
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.
--
Greg Smith 2ndQuadrant US Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com www.2ndQuadrant.us
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To: pgsql-performance@postgresql.org
Cc: greg@2ndquadrant.com, jesper@krogh.cc
Subject: Re: 3ware vs. MegaRAID
In-Reply-To: <4BBF477A.4080701@2ndquadrant.com>
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