FreeNAS HDDのscrubでエラー発生

scrub完了時にエラーメールが来ました。
確認したら、”errors: No known data errors”とメッセージがあったので、問題はないと思います。

Checking status of zfs pools:
NAME     SIZE  ALLOC   FREE    CAP  DEDUP  HEALTH  ALTROOT
test01  8.12T  4.19T  3.94T    51%  1.00x  ONLINE  /mnt

  pool: test01
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://illumos.org/msg/ZFS-8000-9P
  scan: resilvered 60K in 0h0m with 0 errors on Sun May 15 00:00:12 2016
config:

        NAME                                            STATE     READ WRITE CKSUM
        test01                                          ONLINE       0     0     0
          raidz1-0                                      ONLINE       0     0     0
            gptid/faf832e4-a8fc-11e3-9d39-485b3982c76e  ONLINE       0     0     0
            gptid/fb764734-a8fc-11e3-9d39-485b3982c76e  ONLINE       3     2     0
            gptid/fbf5d5d7-a8fc-11e3-9d39-485b3982c76e  ONLINE       0     0     0
        logs
          ada2p1                                        ONLINE       0     0     0
        cache
          ada2p2                                        ONLINE       0     0     0

errors: No known data errors

とりあえず下のコマンドでクリアしてます。

# zpool clear test01