Date: Tue, 24 Jul 2007 14:42:47 +0900 From: Nathan Butcher <n-butcher@fusiongol.com> To: freebsd-current@freebsd.org Subject: Re: (ZFS) zpool replace weirdness Message-ID: <46A59157.1040204@fusiongol.com>
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>I've been playing around with zfs for a bit, and ran into a problem >where i corrupted an entire drive (on purpose) by way of dd >if=/dev/urandom of=/dev/ad12 .. as expected, the zpool noticed: I managed to do something similar, just not exactly the way you described. For starters, I was unable to dd if=/dev/urandom of=/dev/ad3 because dd prevented writing to the device in the zpool. What I did was to "zpool export" my pool, THEN dd over the top of one of my devices. THEN "zpool import" my pool again. The result was a fantastic error:- pool: z state: ONLINE status: One or more devices could not be used because the label is missing or invalid. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the device using 'zpool replace'. see: http://www.sun.com/msg/ZFS-8000-4J scrub: resilver completed with 0 errors on Mon Jun 11 22:09:22 2007 config: NAME STATE READ WRITE CKSUM z ONLINE 0 0 0 raidz1 ONLINE 0 0 0 ad1 ONLINE 0 0 0 4239271840293300479 UNAVAIL 0 0 0 was /dev/ad3 da0 ONLINE 0 0 0 da1 ONLINE 0 0 0 errors: No known data errors Now I'm not sure how to recover the zpool. I can't exactly remove this wonderful numerical device without a "ad3 is in use" error. NB: that I'm running this ZFS on a 32-bit virtual machine with FreeBSD i386 and 768MB memory. No idea if the problem replicates on amd64 with over 1GB memory.help
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