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:[email protected]] On Behalf Of Prather, Wanda Sent: Tuesday, October 12, 2010 9:22 PM To: [email protected] 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:[email protected]] On Behalf Of Tim Brown Sent: Tuesday, October 12, 2010 5:14 PM To: [email protected] 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: [email protected] <<mailto:[email protected]>> Phone: 845-486-5643 Fax: 845-486-5921 Cell: 845-235-4255
