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Off-site tapes also become emptier over time and need to be reclaimed. We
need the reclamation process so that the size of our off-site storage pool does
not grow indefinitely. We already know that reclaiming on-site volumes requires
mounting the volume to be reclaimed, and copying its valid data onto a new tape,
thereby freeing the empty tape for reuse. It would be very inconvenient if
reclaiming off-site volumes also required them to be mounted. Fortunately, this is
not the case.
When an off-site volume is eligible for reclamation, Tivoli Storage Manager will
determine the ON-SITE volumes, which contain the same valid data remaining
on the off-site tape. It mounts the on-site tape and copies those files onto a new
or existing volume belonging to the copy storage pool. This volume is then
eligible to be transported off-site and the old off-site volume now switches to
PENDING and then the EMPTY state. We can then bring it back on-site for
reuse.
Tivoli Storage Manager will only ask to bring the old (unused off-site) tape after
you send the new tape to off-site.
13.7.8 Database backup management
Managing Tivoli Storage Manager database backups is a critical task in the total
environment. Database backups should be done every day, and the copies
should be moved off-site to provide disaster recovery.
The steps involved in the movement of backups from on-site to off-site, and their
return, are similar to those for storage pool data. Tivoli Disaster Recovery
Manager simplifies the management of on-site/off-site tape movement for both
storage pool and database data. We highly recommend using Tivoli Disaster
Recovery Manager.
Moving database backups off-site
The steps that you need to perform to send database backups off-site are:
1. Back up your database.
2. Identify the volumes to be taken off-site.
3. Remove volumes from the library.
4. Move the volumes off-site.
Back up your database
You can perform a backup of the database at any time by using the backup db
command. For examples see 5.8, "Database backup" on page 210.
This task can also be automated using a server script, as shown in Example 12-1
on page 375.
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IBM Tivoli Storage Manager Implementation Guide
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