Oracle Solaris ZFS Administration Guide

Devices That Cannot be Replaced

If the loss of a device causes the pool to become faulted or the device contains too many data errors in a non-redundant configuration, then the device cannot be safely replaced. Without sufficient redundancy, no good data with which to heal the damaged device exists. In this case, the only option is to destroy the pool and re-create the configuration, and then to restore your data from a backup copy.

For more information about restoring an entire pool, see Repairing ZFS Storage Pool-Wide Damage.