Data retention protection ensures that archive objects
are not deleted from the Tivoli® Storage
Manager server until
policy-based retention requirements for that object are satisfied.
It is enforced at the server level by the SET ARCHIVERETENTIONPROTECTION command.
See the Administrator's Reference for
more information.
Retention protection can only be activated on a new server that
does not already have stored objects (backup, archive, or space-managed).
Activating retention protection applies to all archive objects subsequently
stored on that server. After retention protection is set, the server
cannot store backup objects, space-managed objects, or backupsets.
Retention protection cannot be added for an object that was previously
stored on a Tivoli Storage
Manager server.
After an object is stored with retention protection, retention protection
cannot be removed.
Retention protection is based on the retention criterion for each
object, which is determined by the
RETVER parameter
of the archive copy group of the management class to which the object
is bound. If an object uses event-based retention, the object does
not expire until whatever comes later: either the date the object
was archived plus the number of days in the
RETMIN parameter
or the date the event was signaled plus the number of days specified
in the
RETVER parameter. On servers that have
retention protection enabled, the following operations will not delete
objects whose retention criterion is not satisfied:
- Requests from the client to delete an archive object
- DELETE FILESPACE (from either a client or administrative command)
- DELETE VOLUME DISCARDDATA=YES
- AUDIT VOLUME FIX=YES
Important: A cached copy of data
can be deleted, but data in primary storage pools, copy storage pools,
and active-data pools can only be marked damaged and is never deleted.
If your server has data retention protection activated, the following
items are restrictions:
- A registered node cannot be reassigned to a different policy domain.
- You cannot define a device class with a device type of SERVER.
- You can export data but it will not be retention protected after
it is imported.
- You cannot import data to a retention protected server.
The server does not send a retention value to an EMC Centera storage
device if retention protection is not enabled. If this is the case,
you can use a Centera storage device as a standard device from which
archive and backup files can be deleted.