You are right Paul, I misunderstood that part of HSM for Unix, sorry Mehdi.

On Thu, Jun 23, 2011 at 9:21 PM, Paul Fielding <paul AT fielding DOT ca> wrote:

> On Thu, Jun 23, 2011 at 7:07 AM, Stefan Folkerts <
> stefan.folkerts AT gmail DOT com>
>  wrote:
>
> > The trick is that the backup in TSM IS the migrated version of the file,
> so
> > when you migrate you backup.
> >
>
> It's been awhile since I've used HSM on Unix, but (unless something has
> changed) I disagree with this statement.
>
> In Unix HSM (which is the only one I've used), migrated files and backed up
> files are not the same thing.  a migrated file is still at risk of loss.
>  Migrated files use different rules than backed up files, and as such need
> a
> separate backup in order to ensure you're protected.
>
> The most prudent way to do this safely is to ensure that you have TSM set
> to
> require a file be backed up prior to being migrated (set MIGREQUIRESBACKUP
> in mgmt class that you're using for HSM).   This defines that a file will
> not be migrated until it has previously been backed up.  HSM data is
> independent of backup data, can be kept in differing storage pools if
> desired, and do indeed take up their own space.
>
> As long as you have this set, and run regular incremental backups, you'll
> have a good backup of the data in the event the migrated file gets
> deleted/corrupted/lost.   You won't need to worry about the migrated state
> of your files - TSM will keep the full file backed up, regardless if it is
> resident or migrated.
>
> regards,
>
> Paul
>
> This is different in Windows where a backup and a migrated file are two
> > different things because HSM for Windows is archive based and therefor
> not
> > as nice.
> > HSM for Unix rocks!
> >
> > On Thu, Jun 23, 2011 at 2:05 PM, Mehdi Salehi <ezzobad AT gmail DOT com> 
> > wrote:
> >
> > > Hi,
> > > I have two HSM questions:
> > > - Is HSM for Unix included in TSM b/a client?
> > > - What is the way to backup an HSM-managed filesystem? The illusion for
> > me
> > > is that HSM data is not fixed, some of it might be on tape today, but
> > based
> > > on the configurations and actually the need for data, at another time
> the
> > > contents of the filesystem would be totally different. How to
> > > protect/backup
> > > the data?
> > >
> > > Thank you,
> > > Mehdi
> > >
> >
>