From owner-freebsd-geom@FreeBSD.ORG Tue Nov 7 21:06:03 2006 Return-Path: X-Original-To: freebsd-geom@freebsd.org Delivered-To: freebsd-geom@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 86EBA16A403 for ; Tue, 7 Nov 2006 21:06:03 +0000 (UTC) (envelope-from michael.holstein@csuohio.edu) Received: from antispam.csuohio.edu (antispam.csuohio.edu [137.148.18.12]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1997243D55 for ; Tue, 7 Nov 2006 21:06:02 +0000 (GMT) (envelope-from michael.holstein@csuohio.edu) Received: from antispam.csuohio.edu (127.0.0.1) by antispam.csuohio.edu (MlfMTA v3.1r24) id ha3qtq0171su for ; Tue, 7 Nov 2006 16:08:38 -0500 (envelope-from ) Received: from smemlb.csuohio.edu ([137.148.19.11]) by antispam.csuohio.edu (MailFrontier 4.5.3.7159) with ESMTP; Tue, 07 Nov 2006 16:08:38 -0500 Received: from [137.148.2.31] ([137.148.2.31]) by smemlb.csuohio.edu (Lotus Domino Release 6.5.4FP2) with ESMTP id 2006110716055414-100734 ; Tue, 7 Nov 2006 16:05:54 -0500 Message-ID: <4550F532.60207@csuohio.edu> Date: Tue, 07 Nov 2006 16:05:54 -0500 From: Michael Holstein User-Agent: Thunderbird 1.5.0.7 (X11/20060922) MIME-Version: 1.0 To: freebsd-geom@freebsd.org X-MIMETrack: Itemize by SMTP Server on smemlb/CSUOHIO(Release 6.5.4FP2 | September 26, 2005) at 11/07/2006 16:05:54, Serialize by Router on smemlb/CSUOHIO(Release 6.5.4FP2 | September 26, 2005) at 11/07/2006 16:05:55, Serialize complete at 11/07/2006 16:05:55 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=ISO-8859-1; format=flowed X-Mlf-Version: 4.5.3.7159 Subject: SATA raid box and GEOM X-BeenThere: freebsd-geom@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: GEOM-specific discussions and implementations List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Nov 2006 21:06:03 -0000 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