If a separate log device is not mirrored and the device that contains the log fails, storing log blocks reverts to the storage pool.
Log devices can be added, replaced, attached, detached, imported, and exported as part of the larger storage pool. Log devices can be removed starting in the Solaris 10 9/10 release.
Portanto, como faria normalmente . Substitua o dispositivo por si mesmo
# zpool replace tank c0t0d0 c0t0d0
ou remova e adicione novamente:
# zpool remove tank c0t0d0
# zpool add tank log c0t0d0