Date: Thu, 24 Jul 2003 08:46:13 -0700 (PDT) From: Tom Samplonius <tom@sdf.com> To: Scott Long <scottl@freebsd.org> Cc: Josh Brooks <user@mail.econolodgetulsa.com> Subject: Re: aaccli: what kind of disk is it ? Message-ID: <Pine.BSF.4.05.10307240844520.16986-100000@misery.sdf.com> In-Reply-To: <3F201027.3080605@freebsd.org>
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On Thu, 24 Jul 2003, Scott Long wrote: > Tom Samplonius wrote: > > On Wed, 23 Jul 2003, Josh Brooks wrote: > > > >>I have studied the help/usage for aaccli for quite a while, and I cannot > >>figure out how to do two things: > >> > >>a) how can I determine the actual, real size of the disk ? For instance, > >>I have some 36gig drives that are 36.8 gigs unformatted size, and some > >>that are 36.4, and so on - if I want to buy a replacement drive to, say, > >>rebuild a mirror, I have to get one that is the same size or larger - so > >>how, in aaccli, can I see the actual unformatted size of that disk ? > > > > > > Most RAID devices do rounding: 4, 9, 18, 36, 72, etc. So if the device > > is a fraction bigger, it just rounds its capacity down to the standard > > size. > > Not true. Really? I've never seen one that didn't. Replacing disks is a basic requirement of RAID, so it seems odd that anyone would want to make it hard to do. Do you know the which devices don't do this? > > Besides, if you are doing RAID1 or RAID5, the controller can only > > use as much capacity as the smallest disk in the set. So, if you mirror > > a 9GB and 18GB, you will only get a 9GB set. > > > > The point of the question was that if a failed disk is replaced with one > that is fractionally smaller, it won't work. > > Scott Tom
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