Date: Sun, 02 Jan 2011 22:27:59 +0100 From: "Julian H. Stacey" <jhs@berklix.com> To: David Brodbeck <gull@gull.us> Cc: freebsd general questions <freebsd-questions@freebsd.org> Subject: Re: Half a Mirror Backup Message-ID: <201101022128.p02LRxSj037409@fire.js.berklix.net> In-Reply-To: Your message "Sun, 02 Jan 2011 12:30:47 PST." <AANLkTik8XdJoD4nV8cQTy0xkkGiP_TRRpfBQErZyZYjf@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
David Brodbeck wrote: > 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. > > You'd get the backup instantly, but rebuilding the mirror with the incoming > > drive would take a little time and leave you vulnerable to a small loss of > > 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. Ref rsync: Personally I use rdist6, (from familiarity=habit rather than conscious choice, (it's more limited predecessor rdist, has been in BSD a Long time)) But beware: rdist6 fails on files bigger than 2G on i686 but (not on amd64, on amd64 no problem), I wouldnt know if rsync might have a similar 2G restriction. Cheers, Julian -- Julian Stacey, BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com Mail plain text; Not quoted-printable, or HTML or base 64. Avoid top posting, it cripples itemised cumulative responses.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201101022128.p02LRxSj037409>