The following is how TSM handles tapes, I assume VTL would be the same.

Essentially the estimated capacity is assigned to the tape when it is
allocated to a stgpool and loaded into the drive.
This value is determined from the device class    "Est/Max Capacity (MB)"

TSM will not update the capacity again untill it has reached the End Of
Tape.

I have put in an rfe 31662 so that TSM would (better) estimate tape
capacity.
http://www.ibm.com/developerworks/rfe/execute?use_case=viewRfe&CR_ID=31662

The best solution would be to align the estimated capacity for the
device class with the actual data size you expect to fit on a tape.

Grant

On 06/08/14 15:37, Grigori Solonovitch wrote:

TSM 6.3.3.100
VTL on Data Domain
I have found wrong "Estimated Capacity:" for primary storage pools on VTL ( for example, 
for pool with 128 * 64 = 8192GB it gives estimated capacity 18,191 GB in "query stg", but 
it is impossible).
As a result storage pool utilization is calculated wrongly as well.
What is the source of problem?
Data Domain deduplication or something else?
Shall I ignore this problem?

Grigori Solonovitch, Senior Systems Architect, IT, Ahli United Bank Kuwait, 
www.ahliunited.com.kw


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