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 <[email protected]> wrote: > On Thu, Jun 23, 2011 at 7:07 AM, Stefan Folkerts < > [email protected]> > 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 <[email protected]> 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 > > > > > >
