domain.sh script has an option "--cached-dc " , I guess you are looking out for the same. This option can be used to boot HC even when DC is down (with all the caveats above).
--cached-dc If this host is not the Domain
Controller and cannot contact the
Domain Controller at boot, boot using a
locally cached copy of the domain
configuration (see --backup)
--backup Keep a copy of the persistent domain
configuration even if this host is not
the Domain Controller
--backup tells the host-controller to backup the model locally. --cached-dc to not connect to the remote domain-controller and use the locally cached model instead.
OK - thanks a lot - that was exactly what I was searching for.