Question & Answer
Question
What is the difference between the physical and logical space values reported in the QUERY OCCUPANCY output?
Cause
When a backup or archive is performed from a client node, the Tivoli Storage Manager server may group multiple client files into an aggregate object, which represents the individual files. The size of the aggregate depends on the sizes of the client files being stored, and the number of bytes and files allowed for a single transaction. Inevitably, over a period of time some of the files within an aggregate will be expired or deleted, creating empty space within the aggregate.
Answer
The physical space reported in the QUERY OCCUPANCY output reflects the total amount of space occupied by the aggregates, including any empty space within the aggregates. The logical space value reflects only the amount of occupied space by the remaining, valid files within the aggregates. Any empty space within an aggregate created as a result of files having been expired/deleted is not reflected in the logical space value.
Product Synonym
TSM
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Document Information
Modified date:
17 June 2018
UID
swg21636493