Kelly (& Henk),

You are correct.  You would recover from Backup.

I mostly know about this stuff in concept rather than in detail, but
when the FS was recreated you now have a file system with no stub files
on it, so there is no link to what is stored in HSM.  There is a way to
restore the stub files only from ADSM and then link it to the data on
HSM storage.  I do not know the detailed commands however.  I have just
discussed internally & we will be trying this out in the near future!

Of course you MUST always backup a file system even if it is space
managed by HSM.  If you think about it HSM just replaces the online
disk copy with a copy stored on ADSM (most likely tape).  This does not
mean you don't need a backup as well.  It doesn't matter if you backup
before data gets migrated to HSM, as if it is done after, the data gets
copied directly within ADSM, from the HSM storage pools to the backup
storage pools.

Anyway you must backup, to capture the files which are still on disk &
have not been migrated to HSM.

Henk, do you have a backup?

Regards,
Simon