Date: Sun, 2 Jan 2011 12:30:47 -0800 From: David Brodbeck <gull@gull.us> To: freebsd general questions <freebsd-questions@freebsd.org> Subject: Re: Half a Mirror Backup Message-ID: <AANLkTik8XdJoD4nV8cQTy0xkkGiP_TRRpfBQErZyZYjf@mail.gmail.com> In-Reply-To: <4D20D872.3020400@speakeasy.net> References: <4D20D872.3020400@speakeasy.net>
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On Sun, Jan 2, 2011 at 11:56 AM, Jason C. Wells <jcw@speakeasy.net> wrote: > Is using one half of a mirror as a backup a good/bad idea? > > I was thinking of rotating drives on a periodic basis as a back up method= . > =A0You'd get the backup instantly, but rebuilding the mirror with the inc= oming > drive would take a little time and leave you vulnerable to a small loss o= f > data if a disk failed while the mirror was rebuilding. Besides the problem you mention, you'll have a pretty sizable performance hit while the mirror is being rebuilt. Also, keep in mind that the most likely time for a second drive to fail is during a rebuild, since the rebuild forces a read from every sector. I think I would use rsync or dump instead, although I have to admit the rotating mirror idea is clever.
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