Sergio Cherchyk <scherchyk AT BANCORIO.COM DOT AR> writes:

> Hi Per,
> TSM gives you a command (dsmmigundelete) that recreate the stub files if
> they were deleted from your local file system. Having this command there
> would be no need to backup the metadata. At least, it is as far as I
> understand.

Yes, but AFAIK you can only recreate a file if you know the full path
and filename so you need to backup that information somewhere. You also
need to backup unmigrated files, soft links and empty directories.

> Per Ekman wrote:
>
> > Hello,
> >
> > I'm wondering if there is any canonical way of taking backups of
> > metadata in a TSM-HSM managed filesystem (that is non-migrated data
> > such as directories, links and small files) under AIX. What I would
> > like to accomplish is to have each file, migrated or not, stored on
> > two tapes.  As I understand it, if I backup the HSM filesystem using
> > the TSM backup client I'll get a backup of all files. Since I want
> > duplicates of the unmigrated files I'll have to backup the copy
> > pool, but this means that I'll get three copies of migrated files,
> > one in the migration destination pool and two in the backup pools.
> > This is not ideal when you throw a couple of TB of data into you
> > HSM system.
> >
> > Coming from the DMF camp my instinct is to look for an option to the
> > backup client to make it backup only nonmigrated files but I guess
> > there might be some more obscure way of doing it.
> >
> > Deactivating the HSM client and taking a regular backup of the
> > filesystem would probably do what I want but it's not a very
> > attractive solution.

/Per Ekman