Date: Tue, 07 Nov 2006 16:05:54 -0500 From: Michael Holstein <michael.holstein@csuohio.edu> To: freebsd-geom@freebsd.org Subject: SATA raid box and GEOM Message-ID: <4550F532.60207@csuohio.edu>
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I have a Gateway 840 SATA raid box that's fully populated with 250gb drives, but the controller in the unit is subject to the 2^32 SCSI limit, thus I can't use the full capacity as one disk (natively anyway). Thought : The device has 2 SCSI controllers on separate channels, I can allocate each LUN of 1.3tb each to a separate controller on a separate SCSI card, then use geom(stripe) to concat those two into one large volume of ~2.6tb. This is a very busy syslog server. What are the performance issues of using geom (memory/cpu wise)? .. logic would hold that by using 2 SCSI adapters and both ports on the controller, I'd double the effective disk bandwidth (although there are probably other mitigating factors). Am I better off just using the max 2048gb size as one SCSI ID and using gpt to partition it (then newfs the raw device) and calling it a day (forgetting about the extra 500gb)? [I'm not a list subscriber .. so please CC me directly on reply] Thanks, Michael Holstein CISSP GCIA Cleveland State University
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