Have been running a test instance of a NAS using a ZFS as mentioned in Restoring an Ubuntu Server using ZFS RAIDZ for data.

This week one of my disks died. Shouldn't be a problem, should it (the benefits of RAID being resilience as well as performance)?

Except that my ZFS pool got corrupted, as in:

andy@ubuntu:~$ sudo zpool status -v

  pool: tank

 state: UNAVAIL

status: One or more devices could not be used because the label is missing

        or invalid.  There are insufficient replicas for the pool to continue

        functioning.

action: Destroy and re-create the pool from

        a backup source.

   see: http://www.sun.com/msg/ZFS-8000-5E

  scan: none requested

config:



    NAME        STATE     READ WRITE CKSUM

    tank        UNAVAIL      0     0     0  insufficient replicas

      raidz1-0  UNAVAIL      0     0     0  insufficient replicas

        sdb     FAULTED      0     0     0  corrupted data

        sdc     FAULTED      0     0     0  corrupted data

        sdd     UNAVAIL      0     0     0

Fortunately this is a test instance and so I can easily start again. But what if this pool contained important data? What would the right next step(s) be to recover the data and restore my NAS to working order? Or does ZFS automatically try all possible restoration approaches, such that the data is now toast?