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Table 6-4 Migration Policy Configuration Variables (Continued)
Display Field Name
Migrate At Critical
Threshold
Storage Subsystem
6.6.2
Configure the 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 single basic purge policy must be assigned to any disk storage class which requires purge
services. This basic purge policy determines the purge parameters for this storage class across all
storage subsystems. This is the simplest way to control purge on a storage class. If it is desired for
purge on a storage class to behave differently within different subsystems, storage subsystem
specific purge policies may be added which override the default values in the basic policy for the
given storage class in the selected subsystem. 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 using the Purge Policy window. The
basic policy must be created before it is possible to create the subsystem specific policies. After the
policies are created, they may be viewed, updated, or deleted using the same window. From the
HPSS Health and Status window (shown in Figure 6-1 on page 252), click on the Admin menu,
select the Configure HPSS option, and click on the Purge Policies option.
The Purge Policy window will be displayed as shown in Figure 6-8 on page 287. The fields in the
basic policy are displayed with default values for a new policy. If the default data for the basic
policy is not desired, change the necessary fields with the desired values. Click on the Add Basic
button to write the new basic policy to the metadata file. To configure a subsystem specific policy,
select an existing basic policy as described below. Once the existing basic policy is displayed, click
on the Start New button on the Storage Subsystem-Specific Policy portion of the Purge Policy
window. The fields in the new subsystem specific policy are displayed with data extracted from the
HPSS Installation Guide
Release 4.5, Revision 2
Description
A flag that indicates a
migration run should be
started immediately when
the storage class critical
threshold is exceeded. This
option applies to disk
migration only.
The descriptive name of
the storage subsystem to
which a subsystem-
specific policy applies.
This field is filled in with
the selected storage
subsystem name at the
time a subsystem specific
policy is created and may
not be changed
afterwards.
September 2002
Chapter 6
Acceptable Values
ON,
OFF
The descriptive name of any
existing storage subsystem.
HPSS Configuration
Default
Value
OFF
None
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