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administrator.
Start Time. The date and time when the most recent migration run started. It may still be
running.
End Time. The date and time when the last migration run completed.
Total Units Processed. The amount of space in the storage class which has been migrated during
the current or or most recent migration run. For tape storage classes running the tape volume
migration algorithm, this is a number of virtual volumes (VVs).
Control. This pull-down can be used to send commands to the MPS regarding migration on this
storage class. Click on it to drop down a list of control options. These are:
• None - Nothing has been selected for the migration Control.
• Start - If the migration state is Waiting, this starts the migration and puts it into the
Running state.
• Stop - If the migration state is Running, this stops the migration and puts it into the
Waiting state.
• Suspend - If the migration state is Waiting or Running, this puts the migration into the
Suspended state.
• Resume - If the migration state is Suspended, this returns it to Waiting and allows MPS
to again begin scheduling migration runs.
• Reread policy - Tells the MPS to refresh its migration policy information by rereading
the policy.
Pending Operations. When the MPS cannot respond immediately to a Control command, a
command may be saved as pending. Any such pending operations are displayed here.
8.4. Dealing with a Space Shortage
If free space warning thresholds are exceeded in a storage class, HPSS will warn the administrator with
messages in the Alarms and Events window. Before the available storage space in a storage class drops to
a level where the storage class may no longer be able to satisfy requests, efforts should be made to create
additional free space. This can be accomplished by three methods.
The first method is to use the migration and purge functions to free up space. Migration and purge can be
forced manually to run; see Section 8.4.1 Forcing Migration and Section 8.4.2 Forcing Purge. For a long
term solution, it may be desirable to tune the migration and purge policies to cause the automatic
migration and purge operations to occur more frequently. This method of increasing storage space works
for all levels in the Class of Service hierarchy except the lowest level.
The second method is to add additional storage volumes to the storage class using the normal import and
create resources procedures. See Section 8.1 Adding Storage Space on page 223.
The third method is to increase free tape storage space by repacking sparse volumes and reclaiming
empty volumes. The repack program moves information from sparsely filled volumes to other volumes
in the same storage class. When the repack is finished, a number of volumes will be cleared of data. To
make these volumes ready for reuse, they must be processed by the reclaim program, which refreshes the
HPSS Management Guide November 2009
Release 7.3 (Revision 1.0) 258