Date: Fri, 17 Dec 1999 07:35:07 +1030 From: Greg Lehey <grog@lemis.com> To: kiwi@spiritweb.org Cc: freebsd-questions@FreeBSD.ORG Subject: Re: CCD with two slightly different disks Message-ID: <19991217073506.C46720@freebie.lemis.com> In-Reply-To: <38568116.8F2412A0@spiritweb.org> References: <38568116.8F2412A0@spiritweb.org>
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On Tuesday, 14 December 1999 at 18:40:38 +0100, kiwi@spiritweb.org wrote: > > Hi, I do have two 18GB 10krpm disks, yet: > - disk 1: cylinders=2233 heads=255 sectors/track=63 (16065 blks/cyl) > - disk 2: cylinders=2231 heads=255 sectors/track=63 (16065 blks/cyl) > > otherwise the rest of geometry is the same. In the man-page > is says that I won't reach full optimum when interleave (striping) > them. In the archive of freebsd lists I found references that > both disks must be indentical. Before I install an a huge web-site > on a ccd'ed disk I want to make sure my undertake isn't useless or > run into problems at a later time. It depends on what you want to do. It seems you want to stripe, in which case yes, you won't get optimum performance, but given the small difference in size, I don't see that the loss will be measurable. If you want to play it really safe, make the partitions the same size (i.e. drop 2 cylinders from your first disk). Greg -- When replying to this message, please copy the original recipients. For more information, see http://www.lemis.com/questions.html Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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