Hi

Having just done a scrub of a mirror I've lost a file and I'm curious how this
can happen in a mirror.  Doesn't it require the almost impossible scenario
of exactly the same sector being trashed on both disks?  However the
zpool status shows checksum errors not I/O errors and I'm not sure what
that means in this case.
I thought that a zfs mirror would be the "ultimate" in protection but it's not!
Any ideas why and how to protect against this in the future?

(BTW it's osol official release 2009.06 snv_111b)

# zpool status -v
  pool: liver
 state: ONLINE
status: One or more devices has experienced an error resulting in 
data corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the entire 
pool from backup.
   see: http://www.sun.com/msg/ZFS-8000-8A
 scrub: scrub completed after 3h31m with 1 errors 
config:

NAME      STATE  READ WRITE CKSUM
liver     ONLINE  0     0     1
 mirror   ONLINE  0     0     2
  c9d0p0  ONLINE  0     0     2
  c10d0p0 ONLINE  0     0     2

errors: Permanent errors have been detected in the following files:



      
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