DegradedPool

2014-05-13T19:28:39Z

86.103.157.37:

In case you have a degraded pool due to corrupted data on one drive, zpool status will show something like this:

<syntaxhighlight lang="bash">$ sudo zpool status</syntaxhighlight>

<syntaxhighlight lang="text">
pool: tank
state: DEGRADED
status: One or more devices could not be used because the label is missing or
invalid. Sufficient replicas exist for the pool to continue
functioning in a degraded state.
action: Replace the device using 'zpool replace'.
see: http://zfsonlinux.org/msg/ZFS-8000-4J
scan: none requested
config:

NAME STATE READ WRITE CKSUM
tank DEGRADED 0 0 0
raidz1-0 DEGRADED 0 0 0
disk2 ONLINE 0 0 0
disk1 ONLINE 0 0 0
2735026605872377559 FAULTED 0 0 0 was /dev/disk3
disk4 ONLINE 0 0 0

errors: No known data errors
</syntaxhighlight>

Now, look into Disk Utility and find the disk number of the disk which is missing. (In our case disk3).
If you are certain that the corrupted data was not due to a bad disk, (for example if just the labels were messed up), we can reuse the same disk. First, delete the partition table of that disk.

<syntaxhighlight lang="bash">
sudo gpt destroy disk3
</syntaxhighlight>

Replace the missing device in the pool with this disk.

<syntaxhighlight lang="bash">
sudo zpool replace -f tank 2735026605872377559 /dev/disk3
</syntaxhighlight>

The number you see is the one which you saw above at the position of the faulted drive in '''sudo zpool status'''.

The system now starts resilvering the drive. This takes a long time. With '''sudo zpool status''' you can see the progress.

OpenZFS on OS X - User contributions [en]

DegradedPool