strange zpool status output

[Steven Hartland]

zpool status
  pool: tank
 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 in progress for 307445734561825859h27m, 6.96% done, 307445734561825849h8m to go
config:

        NAME        STATE     READ WRITE CKSUM
        tank        ONLINE       0     0     0
          da0s3h    ONLINE       0     0     0

This has only just started scrubbing after a reboot into single user mode
about 5 mins ago, so something looks odd here ;-)

    Regards
    Steve

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