I had a disk malfunction in a raidz pool today. I had an extra on in
the enclosure and performed a: zpool replace pool old new and several
unexpected behaviors have transpired:
the zpool replace command "hung" for 52 minutes during which no zpool
commands could be executed (like status, iostat or list).
When it finally returned, the drive was marked as "replacing" as I
expected from reading the man page. However, it's progress counter
has not been monotonically increasing. It started at 1% and then
went to 5% and then back to 2%, etc. etc.
I just logged in to see if it was "done" and ran zpool status and
received:
pool: xsr_slow_2
state: ONLINE
status: One or more devices is currently being resilvered. The pool
will
continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scrub: resilver in progress, 100.00% done, 0h0m to go
config:
NAME STATE READ WRITE CKSUM
xsr_slow_2 ONLINE 0 0 0
raidz ONLINE 0 0 0
c4t6000393000016A1Fd0s2 ONLINE 0 0 0
c4t6000393000016A1Fd1s2 ONLINE 0 0 0
c4t6000393000016A1Fd2s2 ONLINE 0 0 0
c4t6000393000016A1Fd3s2 ONLINE 0 0 0
replacing ONLINE 0 0 0
c4t6000393000016A1Fd4s2 ONLINE 2.87K 251 0
c4t6000393000016A1Fd6 ONLINE 0 0 0
c4t6000393000016A1Fd5s2 ONLINE 0 0 0
I thought to myself, if it is 100% done why is it still replacing? I
waited about 15 seconds and ran the command again to find something
rather disconcerting:
pool: xsr_slow_2
state: ONLINE
status: One or more devices is currently being resilvered. The pool
will
continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
scrub: resilver in progress, 0.45% done, 27h27m to go
config:
NAME STATE READ WRITE CKSUM
xsr_slow_2 ONLINE 0 0 0
raidz ONLINE 0 0 0
c4t6000393000016A1Fd0s2 ONLINE 0 0 0
c4t6000393000016A1Fd1s2 ONLINE 0 0 0
c4t6000393000016A1Fd2s2 ONLINE 0 0 0
c4t6000393000016A1Fd3s2 ONLINE 0 0 0
replacing ONLINE 0 0 0
c4t6000393000016A1Fd4s2 ONLINE 2.87K 251 0
c4t6000393000016A1Fd6 ONLINE 0 0 0
c4t6000393000016A1Fd5s2 ONLINE 0 0 0
WTF?!
Best regards,
Theo
// Theo Schlossnagle
// CTO -- http://www.omniti.com/~jesus/
// OmniTI Computer Consulting, Inc. -- http://www.omniti.com/
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