ADSM-L

Re: Space Reclamation Processes

2001-06-19 08:06:05
Subject: Re: Space Reclamation Processes
From: Neil Schofield <Neil.Schofield AT YORKSHIREWATER.CO DOT UK>
Date: Tue, 19 Jun 2001 13:07:02 +0100
Stefano

Reclamation processing starts whenever a storage pool contains volumes
which are eligible for migration. That is to say volumes whose 'Percent
Reclaimable Space' exceeds the 'Reclamation Threshold' parameter for the
storage pool. You will get one process for each storage pool containing
eligible volumes.

Since the expiration processing will potentially create volumes eligible
for reclamation in all storage pools, you are seeing multiple reclamation
processes starting as a result.

In order to limit your TSM server to one reclamation process at a time, you
must ensure that only one storage pool contains eligible volumes. Setting
the reclamation threshold for a storage pool to 100% will inhibit all
reclamation processing for that storage pool.

By scheduling adjustments to reclamation thresholds throughout the
day/week/month, you can ensure only one reclamation process.

For example:
Script scheduled on Monday:
UPDATE STGPOOL TAPEPOOL_1 RECLAMATION=60
UPDATE STGPOOL TAPEPOOL_2 RECLAMATION=100
UPDATE STGPOOL TAPEPOOL_3 RECLAMATION=100

Script scheduled on Wednesday:
UPDATE STGPOOL TAPEPOOL_1 RECLAMATION=100
UPDATE STGPOOL TAPEPOOL_2 RECLAMATION=60
UPDATE STGPOOL TAPEPOOL_3 RECLAMATION=100

Script scheduled on Friday:
UPDATE STGPOOL TAPEPOOL_1 RECLAMATION=100
UPDATE STGPOOL TAPEPOOL_2 RECLAMATION=100
UPDATE STGPOOL TAPEPOOL_3 RECLAMATION=60

You may also wish to consider running your expiration processing at set
times of the day, too. To do this, create an admin schedule to run an
EXPIRE INVENTORY daily at a given time. You can then set the server option
EXPINTERVAL to 0 to inhibit automatic expiration.

Hope this helps.

Neil



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