Date: Mon, 19 Jul 2010 11:21:38 -0400 From: Garrett Moore <garrettmoore@gmail.com> To: freebsd-stable <freebsd-stable@freebsd.org> Subject: Problems replacing failing drive in ZFS pool Message-ID: <AANLkTimOrwHe7xiwoap2H2mUtA7vU6TjENkPC4yJ02_z@mail.gmail.com>
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I have an 8-drive ZFS array consisting of WD15EADS drives. One of my disks
has started to fail, so I got a replacement disk. I have replaced a disk
before by:
zpool offline tank /dev/da5
shutting down, swapping from old disk to new disk
booting
zpool replace tank /dev/da5
This worked fine.
This time the failing disk was da3, and I tried the same thing:
zpool offline tank /dev/da3
zpool status showed da3 offline.
shut down, swapped old disk to new disk.
When I booted again, I got:
Code:
NAME STATE READ WRITE CKSUM
tank UNAVAIL 0 0 0 insufficient replicas
raidz1 UNAVAIL 0 0 0 corrupted data
da0 ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
da5 ONLINE 0 0 0
da6 ONLINE 0 0 0
da7 ONLINE 0 0 0
I switched back to the old disk and booted again and then I could access my
data again, and da3 still showed as offline. I tried 'zpool online tank
/dev/da3' and after a few seconds resilvering completed and all 8 drives are
back online again, but with the 'dying' disk as da3 still.
I tried shutting down WITHOUT first offlining /dev/da3, and swapping the
disks, and when I booted I again got 'insufficient replicas'.
Why am I getting this error, and how come it worked ok the last time I
replaced a disk? And more importantly, how do I switch to my new replacement
disk without losing data?
Thanks.
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