Date: Tue, 05 Jul 2011 14:17:39 +0200 From: Michael Fuckner <michael@fuckner.net> To: gerrit.kuehn@aei.mpg.de Cc: freebsd-fs@freebsd.org Subject: Re: Are thumpers still interesting in 2011 ? (raidz3 on x4500 @ 3.0gbps ...) Message-ID: <4E1300E3.9070602@fuckner.net> In-Reply-To: <20110705110721.7506f649.gerrit@pmp.uni-hannover.de> References: <1309793921.2618.YahooMailRC@web120016.mail.ne1.yahoo.com> <4E1212A7.70405@feral.com> <4E1224BE.1020508@cran.org.uk> <20110704211522.GA43675@icarus.home.lan> <20110705090039.17321256.gerrit@pmp.uni-hannover.de> <4E12C34A.8030409@fuckner.net> <20110705101039.701cc042.gerrit@pmp.uni-hannover.de> <4E12CD57.7030403@fuckner.net> <20110705110721.7506f649.gerrit@pmp.uni-hannover.de>
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On 07/05/2011 11:07 AM, Gerrit K=FChn wrote: Hi Gerrit, > I think then I get an SFF8087 lane (or even infiniband, which is even > more expensive) with 24 drives connected and face the same issue: which > controller do I connect this to? You mean like CX4 Connectors for SAS or Infiniband over CX4/ QSFP Connectors? I'd stick with LSI 9211-4i + 846E16 Chassis (http://www.supermicro.nl/products/chassis/4U/846/SC846E16-R1200.cfm) SAS Controllers (HBA or RAID) typicially use Chips with 8 external Ports. If you buy a Controller with more ports, they solder an Expanderchip to the raidcard (LSI SAS2x36, http://lsi.com/products/storagecomponents/Pages/LSISAS2x36.aspx or PMC PM8005, http://www.pmc-sierra.com/products/details/pm8005/). So in both ways (HBA with 24 ports, single cables to each HDD) or HBA with 4/8 ports, Expanderchip on the backplane), the topology is identical- and the expandersolution has less cabeling which makes the whole system more reliable. Regards, Michael!
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