zfs不能自动挂载

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root@:~# mfiutil show drives
mfi0 Physical Drives:
(  932G) ONLINE  <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30460679> SATA enclosure 1, slot 0
(  932G) ONLINE  <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30490135> SATA enclosure 1, slot 1
(  932G) ONLINE  <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30694135> SATA enclosure 1, slot 2
(  932G) REBUILD <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30689984> SATA enclosure 1, slot 3
(  932G) ONLINE  <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30503433> SATA enclosure 1, slot 4
(  932G) ONLINE  <WDC WD1003FBYX-0 1V01 serial=WD-WCAW30695877> SATA enclosure 1, slot 5


一台freebsd用zfs做文件系统，重启系统之后突然不能挂载，请问如何修复？

如果用以下命令，应该会重建整个分区，数据全丢了吧。

zpool create -f /dev/xxx /x1TB

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zpool status -x
  pool: a4TB
state: FAULTED
status: The pool metadata is corrupted and the pool cannot be opened.
action: Destroy and re-create the pool from a backup source.
   see: http://www.sun.com/msg/ZFS-8000-72
scrub: none requested
config:

        NAME        STATE     READ WRITE CKSUM
        a4TB        FAULTED      0     0     1  corrupted data
          mfid1     ONLINE