Date: Thu, 24 Jul 2003 10:58:15 -0600 From: Scott Long <scottl@freebsd.org> To: Tom Samplonius <tom@sdf.com> Cc: Josh Brooks <user@mail.econolodgetulsa.com> Subject: Re: aaccli: what kind of disk is it ? Message-ID: <3F201027.3080605@freebsd.org> In-Reply-To: <Pine.BSF.4.05.10307232144570.16986-100000@misery.sdf.com> References: <Pine.BSF.4.05.10307232144570.16986-100000@misery.sdf.com>
next in thread | previous in thread | raw e-mail | index | archive | help
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. > 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
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3F201027.3080605>