Troubleshooting
Problem
How does COLLOCATION affect the transaction processing for a tape storage pool? Can this affect performance when backing up the Tivoli Storage Manager primary storage pool to a tape copy storage pool?
Cause
The default setting for COLLOCATE is GROUP.
Resolving The Problem
The Tivoli Storage Manager server processes files being copied or moved to a tape storage pool based on the COLLOCATION setting:
- If COLLOCATE is set to Group: All files belonging to a Group will be processed in a separate transaction.
- If COLLOCATE is set to Node: All files belonging to a specific Node will be processed in a separate transaction.
- If COLLOCATE is set to Filespace: All files belonging to a Filespace will be processed in a separate transaction.
The amount of time for the transaction processing is dependent on the number of objects being processed, not the amount of data. Depending on the number of files in the storage pool, which node or filespace owns these objects, and the setting for COLLOCATION, the performance for the Tivoli Storage Manager server to process the movement of this data can be affected.
If the COLLOCATION setting is FILESPACE, the amount of time for committing the transactions on the Tivoli Storage Manager server may take longer than with a setting of GROUP (due to the increased number of transactions). If the performance statistics for the Tivoli Storage Manager server are showing a lot of time spent in "Tape Commit" the COLLOCATION setting should be checked; setting COLLOCATE to a value of GROUP may increase the performance when running a storage pool backup.
Related Information
[{"Product":{"code":"SSGSG7","label":"Tivoli Storage Manager"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Component":"Server","Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"All Supported Versions","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]
Product Synonym
TSM
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Document Information
Modified date:
17 June 2018
UID
swg21575703