Troubleshooting
Problem
The QUERY STGPOOL administrative command provides an estimated capacity value which represents an estimate of the total space of all the volumes in the FILE storage pool. Is it normal to see a difference between a primary and copy pool ?
Resolving The Problem
The total estimated capacity of a Tivoli Storage Manager server FILE storage pool is calculated using the actual capacity of the volumes currently in-use and the number of unused scratch volumes, depending on the space available in the file system used by the FILE device class.
Since the total estimated capacity depends on the available space in the file system, the amount of potential space that could be used must first be calculated. This value is calculated as follows:
Empty volumes = number of empty volumes defined to FILE storage pool
Potential volumes = number of unused scratch volumes in the FILE pool
Capacity = Maximum capacity defined for the FILE device class..
Potential capacity = (Empty volumes + Potential volumes ) * Capacity
The "Potential capacity" may however exceed the physical amount of space available in the file system. Therefore the "Available capacity" is the maximum value, i.e,
Available capacity = Maximum between "Potential capacity" and "free space in file system".
For example, assuming there "Potential capacity" is calculated to be 300 GB but there is only 100 GB left in the file system, then the "Available capacity" is 100 GB.
Finally, the total estimated capacity value for the FILE storage pool is calculated as follows:
(Current capacity of in-use volumes) + (Available capacity)
The following command may be used to get the current capacity of in-use volumes in the storage pool :
select sum(EST_CAPACITY_MB) from volumes where stgpool_name='FILEPOOL'
Because the of this, the total estimated capacity values for primary and copy FILE storage pools may not necessarily match even though the number of files and logical MB stored match.
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Document Information
Modified date:
17 June 2018
UID
swg21388524