I believe there are a couple of ways that work. The commands I've
always used are to attach the new disk as a spare (if not already) and
then replace the failed disk with the spare. I don't know if there are
advantages or disavantages but I also have never had a problem doing it
this way.
Andreas Höschler wrote:
Dear managers,
one of our servers (X4240) shows a faulty disk:
------------------------------------------------------------------------
-bash-3.00# zpool status
pool: rpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t0d0s0 ONLINE 0 0 0
c1t1d0s0 ONLINE 0 0 0
errors: No known data errors
pool: tank
state: DEGRADED
status: One or more devices are faulted in response to persistent
errors.
Sufficient replicas exist for the pool to continue functioning
in a
degraded state.
action: Replace the faulted device, or use 'zpool clear' to mark the
device
repaired.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tank DEGRADED 0 0 0
mirror ONLINE 0 0 0
c1t2d0 ONLINE 0 0 0
c1t3d0 ONLINE 0 0 0
mirror ONLINE 0 0 0
c1t5d0 ONLINE 0 0 0
c1t4d0 ONLINE 0 0 0
mirror DEGRADED 0 0 0
c1t6d0 FAULTED 0 19 0 too many errors
c1t7d0 ONLINE 0 0 0
errors: No known data errors
------------------------------------------------------------------------
I derived the following possible approaches to solve the problem:
1) A way to reestablish redundancy would be to use the command
zpool attach tank c1t7d0 c1t15d0
to add c1t15d0 to the virtual device "c1t6d0 + c1t7d0". We still would
have the faulty disk in the virtual device.
We could then dettach the faulty disk with the command
zpool dettach tank c1t6d0
2) Another approach would be to add a spare disk to tank
zpool add tank spare c1t15d0
and the replace to replace the faulty disk.
zpool replace tank c1t6d0 c1t15d0
In theory that is easy, but since I have never done that and since this
is a productive server I would appreciate if somone with more
experience would look on my agenda before I issue these commands.
What is the difference between the two approaches? Which one do you
recommend? And is that really all that has to be done or am I missing a
bit? I mean can c1t6d0 be physically replaced after issuing "zpool
dettach tank c1t6d0" or "zpool replace tank c1t6d0 c1t15d0"? I also
found the command
zpool offline tank ...
but am not sure whether this should be used in my case. Hints are
greatly appreciated!
Thanks a lot,
Andreas
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