What determines that a restore job will be "restartable"?  I've looked in
both the server and client manuals but all I have found are instructions for
restarting or querying restartable restores.  The online help for the client
had some information about options that would make a restore
non-restartable, but we thought we had met the requirements and the restores
still do not show up as restartable.  I queried the list for "restartable"
and found some information, but nothing specific.  If you can point me to
the information about this I would appreciate it.

Thanks