Sun Microsystems Virtual Tape Library - Manual (Page 204)

Automated tape caching
190 VTL User Guide • May 2008 G • 96267
Description:
This command can be used in order to enable, disable, or change the Automated
Tape Caching policy for a virtual tape library.
‐L (‐‐tape‐library‐vid) is the virtual device ID of the virtual tape library to be set.
Set ‐t (‐‐tape‐caching‐enable) to 1 for enable or 0 to disable.
If the disable option is used all other arguments will be ignored.
The enable option must be used in order to set or change the tape caching policy.
Time based data migration triggers:
‐S (‐‐start‐time) alone can be used to start daily migrations at the time specified. The
default value is 00:00(am)(hh:mm). When combined with other data migration
triggers, the ‐S option will delay the migration execution to the specified time.
‐W (‐‐day‐of‐the‐week) can be used to start weekly migrations on the specified day
at 00:00(am): Sunday: 0, Monday: 1, ..., Saturday: 6. The default value is ‐1. This
option is ignored if Policy Based triggers are used.
Policy based data migration triggers:
‐b (‐‐trigger‐combine) tells how trigger policies are combined (specified by ‐e, ‐c, ‐d).
1 ‐‐ and; 0 ‐‐ or. The default value is 1 (and).
‐e (‐‐end‐of‐backup) triggers data migration when unloading a tape from a drive
after some data is written to it.
‐f (‐‐tape‐full) applies to ‐e options. Data is migrated only if the tape becomes full.
‐c (‐‐disk‐capacity) triggers data migration when disk usage percentage is above the
global disk space threshold.
‐d (‐‐days‐old) triggers date migration after data was retained on disk for (days‐old)
days (up to 3650 days).
Reclamation triggers:
‐R (retention‐days) determines the number of days virtual tapes will be kept in the
system before they are deleted.
Select ‐I (‐‐immediately) and virtual tapes will be deleted immediately after data
migration completes.
Select ‐M (‐‐no‐more‐space) and virtual tapes will be deleted when disk space is
needed to create (or expand) a virtual tape. The last used will be deleted.
Select ‐N (‐‐never) and virtual tapes will never be deleted.
The reclamation triggers are exclusive.