Ominous smartd messages ....

Matthew Seaman matthew at
Wed Aug 3 20:13:23 UTC 2016

On 03/08/2016 20:13, William A. Mahaffey III wrote:
> What does this mean ?

That there's a bad spot on the disk, which may also mean that you've got
a corrupted filesystem -- depends if the bad spot was in use by zfs or
not.  'zpool scrub' should tell you if the filesystem is corrupted.

Time to replace the drive.  You should be able to convert the vdev that
contains the failing drive into a mirror temporarily, and sync the data
without downtime beyond maybe a few reboots to install the new disk
(assuming you have space to plug the new drive in without unplugging any
of the old ones).  Failing that, you're going to need to rebuild the
zpool from scratch and restore your data from backup.

Also, the fact that you have how ever many terabytes of data with no
resilience just makes me feel on edge -- and it's not even my data.

Strongly recommend rebuilding your zpool as a RAIDZ of 8 drives -- yes,
you'll end up with less usable space, but you and your data will survive
failure of a drive and a 'zpool scrub' will be able to fix things even
if a bad spot on one drive has scrambled some of your data.

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