260IBM Tivoli Storage Manager Versions 5.4 and 5.5 Technical Guide
20.1 Migration thresholds for sequential disk
Before Tivoli Storage Manager V5.5, sequential migration thresholds are derived based upon
individual volume usage and do not consider the overall utilization of the storage pool. This
method works very well for sequential access media such as tapes, but has limitations when
using the FILE device class for sequential operations.
A FILE device utilizes random access technology (disk) and has different characteristics than
other sequential-access media. Per-volume usage is not as important as overall pool usage.
FILE pools are constr ...
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