Define virtual volume expiration time
This topic provides instructions to define virtual volume expiration time.
Use the Categories panel on the TS7700 Management Interface to define
the virtual volume expiration time. If the Delete Expired Volume Data setting is not used, virtual
volumes occupy space on the physical volumes even after they have been returned to scratch. In that
case, only when a virtual volume is rewritten is the old data that is released to reduce the amount
of active data on the physical volume. With the Delete Expired Volume Data setting, the data that is
associated with volumes that have been returned to scratch are deleted after a time period and their
old data released.
For example, assume that you have 20 000 virtual volumes in scratch status at any point in time, that the average amount of data on a virtual volume is 400 MB, and that the data compresses at a 2:1 ratio. The space that is occupied by the data on those scratch volumes is 4 000 000 MB or the equivalent of 14 (fourteen) 3592 JA cartridges. By using the Delete Expired Volume Data setting, you could reduce the number of cartridges required in this example by 14.
The
parameter Expire Time specifies the amount of time in hours, days, or years.
- When specifying years the max value is 2000
- When specifying days the max value is 3650
- When specifying hours the max value is 87600