> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
> boun...@opensolaris.org] On Behalf Of Didier Rebeix
>       from ZFS documentation it appears unclear to me if a "zpool
> scrub" will black list any found bad blocks so they won't be used
> anymore.

If there are any physically bad blocks, such that the hardware (hard disk)
will return an error every time that block is used, then the disk should be
replaced.  All disks have a certain amount of error detection/correction
built in, and remap bad blocks internally and secretly behind the scenes,
transparent to the OS.  So if there are any blocks regularly reporting bad
to the OS, then it means there is a growing problem inside the disk.
Offline the disk and replace it.

It is ok to get an occasional cksum error.  Say, once a year.  Because the
occasional cksum error will be re-read and as long as the data is correct
the second time, no problem.

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