Solaris: ZFS root pools hang system when unavailable

While we are talking about ZFS and not ZFSSA "Systems with a ZFS Root Filesystem Running Certain Solaris 10 patches or Solaris 11 SRUs may Hang if the Disks of the Root Pool Become Temporarily Unavailable" is still a good document to read on My Oracle Support from article ID 2098232.1 so you can learn what symptoms are possible on Solaris just in case this happens to your system!