Received: from maia.hub.org (unknown [200.46.208.211]) by mail.postgresql.org (Postfix) with ESMTP id 6164A633DA9 for ; Fri, 9 Apr 2010 12:28:09 -0300 (ADT) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.208.211]) (amavisd-maia, port 10024) with ESMTP id 24632-09 for ; Fri, 9 Apr 2010 15:27:58 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.17.10]) by mail.postgresql.org (Postfix) with ESMTP id 7744C6339FB for ; Fri, 9 Apr 2010 12:27:58 -0300 (ADT) Received: from [192.168.0.105] (pool-96-244-14-10.bltmmd.fios.verizon.net [96.244.14.10]) by mrelayeu.kundenserver.de (node=mreu2) with ESMTP (Nemesis) id 0M5Ksl-1NaDsi20f1-00zT7F; Fri, 09 Apr 2010 17:27:56 +0200 Message-ID: <4BBF477A.4080701@2ndquadrant.com> Date: Fri, 09 Apr 2010 11:27:54 -0400 From: Greg Smith User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: Jesper Krogh CC: pgsql-performance@postgresql.org Subject: Re: 3ware vs. MegaRAID References: <4BB1FAAF.7050406@wp.pl> <4BB23254.2040109@2ndquadrant.com> <4BBB662C.8030102@wp.pl> <23D26E38-9852-4EB6-9DF9-FCB2EAE1EE6C@richrelevance.com> <4BBECA06.40602@krogh.cc> In-Reply-To: <4BBECA06.40602@krogh.cc> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V01U2FsdGVkX19B5sYOdbz8ftG0T9QlnYn08JoYV/ordV6YdSe c9IBWfDgqbkt+Rtez/hcCWpxxcpkKt3V1GeVSwK6hUfDW3gs8v 7Cfg3JQ51fFLybD7oSMWIFxFX1Flp+3 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.054 tagged_above=-10 required=5 tests=AWL=-1.054 X-Spam-Level: X-Archive-Number: 201004/116 X-Sequence-Number: 38366 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