Unicenter CA-VMAN Cellpool Tuning Feature

Document ID : KB000055633
Last Modified Date : 14/02/2018
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Purpose of this feature:

Cellpool tuning helps maximize the functionality of Unicenter CA-VMAN. Beginning with r3.1, administrators no longer need to add new buffer pool sizes as all possible sizes have been designed into Unicenter CA-VMAN's internal code.


Unicenter CA-VMAN r3 had one set of storage allocations that were used by all sites big or small. For r3, customer sites also had to define all of the BUFFER cellpools that they needed at their site. Unicenter CA-VMAN r3.1 eliminates the need to add the BUFFER pools.


Unicenter CA-VMAN loads all of the information related to Applications, Terminals, and VTIDS into storage at initialization time. When users log on, Unicenter CA-VMAN loads all the information about the user into storage. Unicenter CA-VMAN does this, as opposed to constantly accessing the database, to speed up response times for the end user. However, this process can also lead to higher CPU utilization and large amounts of storage usage. Sites have the ability to define the amount of storage that they use during installation via the Unicenter CA-VMAN Storage Pool Panel (CAVA130) within the Administrator application. This panel shows each storage pool, the size of the cell in the pool, and the number of cells in the primary allocation, and the number of cells in each secondary allocation.

The fields displayed in the Storage Pool Panel (CAVA130):

  1. Pool ID - the Name or ID of the Storage pool. (One to eight characters).

  2. Cell Size - The size of the cell for that particular pool. (One to four digits).

  3. Primary # of cells - The initial number of cells obtained for this pool. (One to four digits).

  4. Secondary # of cells/Extents - The number of cells obtained for this pool on a secondary allocation. (One to four digits).

The allocations for cellpools that are rarely used may be lowered as needed. Secondary extents can be adjusted to decrease the number of extents that get allocated at startup. The DCP command should be used to assist in determining the proper allocations.

Cell Pool Tuning allows for a much more efficient use of Virtual Storage within the Unicenter CA-VMAN address space. Extending the scope of the BUFFER cell pool tuning mechanism allows for the tuning of all of the Unicenter CA-VMAN storage pools. Possible values have been built into the process where the primary number of cells per extent can have a minimum value of zero, thus allowing a smaller Unicenter CA-VMAN region. If Unicenter CA-VMAN customers determine they no longer need or utilize a particular pool, they may save virtual storage space by not allocating any space for that storage pool.