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 safely be 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, restoring your data in the process.

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