HP Instant Capacity User's Guide for versions 8.x > Chapter 4 Using Instant Capacity to Manage Processing Capacity

Unassigning a Cell from a Partition

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When a cell is unassigned from a partition in a system with Instant Capacity, the number of intended active cores in the partition decreases only if the number of cores being removed with the cell is greater than the number of expected inactive cores in the partition. In the following example of a single partition system with 3 cells, the number of intended active cores remains the same because the number of cores with the removed cell (4) does not exceed the total number of expected inactive cores in the partition (6).

Table 4-4 Partition pre-modification state: Three cells with 2 active and 2 inactive cores in each (total of 6 active cores)

Cell 1Cell 2Cell 3
A A I IA A I IA A I I
 

Table 4-5 Partition post-modification state: Cell 3 is unassigned (total of 6 active remains)

Cell 1Cell 2
A A A IA A A I
 

Table 4-6 Partition post-modification state: Unassigned cell (Cell 3) with 4 inactive cores

Cell 3
I I I I
 

When Cell 3 is unassigned from the partition, the number of intended active cores for the partition remains at 6. When the partition is rebooted, a total of 6 cores are activated. Cell 3 becomes an unassigned cell with 4 inactive cores, essentially freeing up usage rights which are distributed among the remaining cells.

In the next example of unassigning a cell from a partition, the number of cores removed (4) is greater than the number of expected inactive cores in the partition (3). When this happens, the number of intended active cores is automatically set to the total number of remaining cores in the partition (8).

Table 4-7 Partition pre-modification state: Three cells with 3 active and 1 inactive cores in each (total of 9 active cores)

Cell 1Cell 2Cell 3
A A A IA A A IA A A I
 

Table 4-8 Partition post-modification state: Cell 3 is unassigned (total of 8 active is set)

Cell 1Cell 2
A A A AA A A A
 

Table 4-9 Post-modification state: Unassigned cell (Cell 3) with 4 inactive cores. The system has usage rights available for one additional core.

Cell 3

Available Usage Rights
I I I I

UR
 

When Cell 3 is unassigned from the partition, the number of intended active cores is changed from 9 to 8 (because 8 is the total number of cores remaining in the partition). When the partition is rebooted, a total of 8 cores are activated. Cell 3 becomes an unassigned cell with 4 inactive cores and there are (unused) usage rights available for one additional core for the complex.

NOTE: If your intent is to migrate a cell from one partition to another, you can control the number of cores available to the cell by deactivating cores in the partition you removed the cell from. By deactivating cores, you are freeing up core usage rights for the entire complex.