Why does resilvering an entire disk, yield different amounts of data that was
resilvered each time.
I have read that ZFS only resilvers what it needs to, but in the case of
replacing an entire disk with another formatted clean disk, you would think the
amount of data would be the same each time a disk is replaced with an empty
formatted disk.
I'm getting different results when viewing the 'zpool status' info (below)
For example ( I have a two-way mirror with a small file on it )
Raidz pools behave the same.
bash-3.2# zpool replace zp c2t27d0 c2t28d0
bash-3.2# zpool status
pool: zp
state: ONLINE
scrub: resilver completed after 0h0m with 0 errors on Mon Oct 26 09:46:21 2009
config:
NAME STATE READ WRITE CKSUM
zp ONLINE 0 0 0
mirror ONLINE 0 0 0
c2t26d0 ONLINE 0 0 0
c2t28d0 ONLINE 0 0 0 [b] 73K resilvered[/b]
errors: No known data errors
bash-3.2#
bash-3.2# zpool replace zp c2t28d0 c2t29d0
bash-3.2# zpool status
pool: zp
state: ONLINE
scrub: resilver completed after 0h0m with 0 errors on Mon Oct 26 09:46:52 2009
config:
NAME STATE READ WRITE CKSUM
zp ONLINE 0 0 0
mirror ONLINE 0 0 0
c2t26d0 ONLINE 0 0 0
c2t29d0 ONLINE 0 0 0 [b]83.5K resilvered[/b]
errors: No known data errors
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