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Description
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While working on something else, I noticed that if you have a mirror of two devices, A and B, and you need to resilver B, you end up getting writes to A as well -- not nearly as many, but not zero like you'd expect:
# zpool destroy boo
# zpool create boo mirror /var/tmp/a /var/tmp/b
# zpool offline boo /var/tmp/b
# mkfile 100m /boo/hoo
# sync
# zpool online boo /var/tmp/b
# zpool status -v boo
pool: boo
state: ONLINE
status: One or more devices has experienced an unrecoverable error. An
attempt was made to correct the error. Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
using 'zpool clear' or replace the device with 'zpool replace'.
see: http://www.sun.com/msg/ZFS-8000-9P
scrub: resilver completed after 0h0m with 0 errors on Wed Oct 15 16:23:26 2008
config:
NAME STATE READ WRITE CKSUM
boo ONLINE 0 0 0
mirror ONLINE 0 0 0
/var/tmp/a ONLINE 0 0 0 66K resilvered
/var/tmp/b ONLINE 0 1.15K 0 100M resilvered
errors: No known data errors
Notice the 66K resilvered to side A.
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