Date: Thu, 11 Aug 2011 19:30:07 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Martin Cracauer <cracauer@cons.org> Cc: freebsd-fs@FreeBSD.org Subject: Re: ZFS zpool mirror drive replacement confusion Message-ID: <4E44038F.7000001@FreeBSD.org> In-Reply-To: <20110811160314.GA25076@cons.org> References: <20110811160314.GA25076@cons.org>
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on 11/08/2011 19:03 Martin Cracauer said the following: > My computer keeps doing what I say, not what I want :-) > > This zpool with a 2-drive mirror had a dead drive (ad10) which I > removed. After I tried to put ad2 as a replacement drive I ended up > with the drive not in the mirror, it seems to have extended the zpool > (it's size?). > > NAME STATE READ WRITE CKSUM > cbackup3 DEGRADED 0 0 0 > mirror DEGRADED 0 0 0 > ad6 ONLINE 0 0 0 > ad10 REMOVED 0 0 0 > ad2 ONLINE 0 0 11 > > Unfortunately I didn't keep note of the specific command that I used. > > Two questions: > > - Does somebody know offhand what I did and what I should have done > instead to get ad2 into the mirror? You confused 'add' and 'attach' commands or something like that. > - Would there have been a way to remove ad2 from this set? No. > It didn't > let me, saying it can only remove drives from mirror or raid sets. > I think it should have been possible before I mounted the filesystem > in there read-write for the first time after the drive add. This > seems like an easy mistake to make. This has been reported to the ZFS people (upstream) many times, still they didn't add any safety nets. > The array doesn't contain important data, just trying to sort out > things for the future. Read the docs, twice, be careful, take backups before any modifying actions. -- Andriy Gapon
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