Strange ZFS filesystem corruption

[Artem Belevich]

On Mon, Oct 3, 2011 at 11:21 AM, Paul Mather <paul at gromit.dlib.vt.edu> wrote:
> =====
>
> The pool itself reports no errors.  I performed a scrub on the pool yet this bizarre filesystem corruption persists:
>
> =====
> tape# zpool status backups
>  pool: backups
>  state: ONLINE
>  scan: scrub repaired 15K in 7h33m with 0 errors on Sat Oct  1 19:22:35 2011

The pool *did* report 15K errors that it was able to repair.

I'd start with testing your RAM with memtest86 or memtest86+. ZFS
errors without reported checksum errors may be the sign of bad memory.
I.e. data gets corrupted before ZFS gets to calculate checksum and
later invalid data with valid checksum gets written to disk.

--Artem