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IBM Tivoli Storage Manager Implementation Guide
storage pool, selecting a threshold to trigger reclamation. Then you would wait
for a period of time, and run another
update stgpool
command to reset the
reclamation threshold to its previous value. You can still use the two-step update
storage pool method, but the
reclaim stgpool
command is preferred.
The
reclaim stgpool
command takes a number of options. To set the reclamation
threshold, set the THreshold parameter to a value between 50 and 99. The
THReshold value represents the percentage of reclaimable space required on a
volume, in order for it to be eligible to be reclaimed. To check the amount of
reclaimable space on a volume, run a
query volume
command. Subtract the value
in the Pct Utilized column from 100 to obtain the percentage of reclaimable
space on the volume. The other parameter required for
reclaim stgpool
is the
DUration parameter. DUration is the length of time reclamation will run for on the
selected storage pool.
Each sequential storage pool should have one schedule to perform reclamation.
We have three sequential storage pools in our recommended configuration.
Example 12-10 shows three schedules to perform the reclamations. We
specified a threshold of 85 so that only volumes with 15% or less utilization of
valid data will be reclaimed in this operation.
Example 12-10 Defining reclamation schedules
tsm: LOCHNESS_SERVER1>
define schedule RECLAIM_OFFDIRS type=admin
description="Perform reclamation on the OFFDIRS storage pool" cmd="reclaim stgpool
offdirs threshold=85 duration=60" starttime=11:00 active=yes
ANR2577I Schedule RECLAIM_OFFDIRS defined.
tsm: LOCHNESS_SERVER1>
define schedule RECLAIM_OFFDATA type=admin
description="Perform reclamation on the OFFDATA storage pool" cmd="reclaim stgpool
offdata threshold=85 duration=180" starttime=12:00 active=yes
ANR2577I Schedule RECLAIM_OFFDATA defined.
tsm: LOCHNESS_SERVER1>
define schedule RECLAIM_TAPEDATA type=admin
description="Perform reclamation on the TAPEDATA storage pool" cmd="reclaim
stgpool tapedata threshold=85 duration=180" starttime=15:00 active=yes
ANR2577I Schedule RECLAIM_TAPEDATA defined.
tsm: LOCHNESS_SERVER1>
q sched reclaim* t=a
* Schedule Name
Start Date/Time
Duration
Period
Day
-
----------------
--------------------
-------- ------ ---
RECLAIM_OFFDATA
02/21/2006 12:00:00
1 H
1 D
Any
RECLAIM_OFFDIRS
02/21/2006 11:00:00
1 H
1 D
Any
RECLAIM_TAPEDATA
02/21/2006 15:00:00
1 H
1 D
Any
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