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To delete a migration policy, select the policy from the Migration Policies list window and press the
Delete button. If a basic policy is selected, and the policy has sub-system specific policies associated
with it, a prompt will appear asking if the basic policy and the related sub-system specific policies should
all be deleted since they must be deleted before the basic policy can be.
A migration policy may also be deleted by pressing the Delete button on the Migration Policy
configuration window for the policy. Sub-system specific policies can be individually deleted from the
Migration Policy configuration window for the policy by selecting the specific subsystem's tab and
pressing the Delete Subsystem Policy button.
6.5. Purge Policies
A purge policy is associated with a disk storage class and defines the criteria by which data is purged
from that storage class once migration has copied that data to storage classes at lower levels in the
storage hierarchies.
A basic purge policy must be assigned to all disk storage classes that require purge services. This basic
policy determines the purge parameters for the storage class across all storage subsystems. If individual
purge policies are desired for specific storage sub-systems, storage sub-system specific purge policies
may be added which override the default values in the basic policy. The storage subsystem specific purge
policies share the same purge Policy ID and Policy Name with the basic policy.
Both basic and subsystem specific purge policies are created and managed using the Purge Policies
window. The basic policy must be created before creating the subsystem specific policies.
6.5.1. Purge Policies Window
This window displays a list of all the purge policies configured in the system.
To create a new purge policy, press the Create New button in the Purge Policies window. A new Purge
Policies window appears. Enter the desired parameters for the policy, and then press the Add button. The
policy will be added to the system. If sub-system specific policies are desired, press the New Subsystem
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 189