Just one comment...there are actually  2 copies of the migrated file's data.
1 is the backup copy and the other is the migrated copy. You can configure
HSM to make sure there is a backup copy of the file before migration. But
since you're going on last referenced date, then probably that file was
backed up when it was created or last updated. The most recent versions of
HSM and the B/A client have more knowledge of each other than pre 5.5
versions. The B/A client will recognize the stub file and not back that the
most recent backup copy of the file. When you restore that file from the B/A
client possibly due to someone deleting the stub file, or a crash, you have
the option of restoring the file data or just the stub.

Just make sure that when you configure the policy for the HSM on the TSM
server you change the archive retention to NOLIMIT and activate it! Believe
me it's messy when TSM starts expiring the migrated archive data when there
are still stub files on the filesystems. Been there...done that...and lots
of teeth marks in my arse!

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Prather, Wanda
Sent: Tuesday, October 12, 2010 9:22 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: Tsm archiving or HSM

There is nothing built in to TSM that does archiving based on last reference
date.
You can certainly write your own scripts to select the files and archive
based on that.

There are larger difference between archiving and HSM.
Archives:
-the same file can be archived multiple times on different dates -an archive
file may be left in the directory, or removed from the directory after
archive -to retrieve an archived file, you must deliberately open the TSM
client and select the file for retrieve

HSM:
-There is only 1 copy of an HSM-migrated file, the migrated copy.
-HSM leaves a stub file in the directory when it migrates the file out to
TSM storage.  Any attempt by the user to reference that file triggers an
automatic recall  (which has implications for your TSM hardware setup).



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Tim
Brown
Sent: Tuesday, October 12, 2010 5:14 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Tsm archiving or HSM

Does the archiving function allow archiving files based on last reference
date or is that what TSM HSM is for ?

Thanks

Tim Brown
Systems Specialist - Project Leader
Central Hudson Gas & Electric
284 South Ave
Poughkeepsie, NY 12601
Email: tbrown AT cenhud DOT com <<mailto:tbrown AT cenhud DOT com>>
Phone: 845-486-5643
Fax: 845-486-5921
Cell: 845-235-4255