HP Instant Capacity Version 10.x User Guide (5900-1581, March 2011)

to the icapstatus value for Additional cores that can be activated with current
usage rights or the actual number of cores, whichever is smaller. In order to assign an inactive
cell to a partition, this value must be nonzero.)
However, when a new partition is created via the parcreate command, core usage rights must
be available for all cores configured on the new partition's cells, and core usage rights are
automatically assigned to these new cells. For more information see “New Partition Creation and
Instant Capacity” (page 160).
Note that when determining available usage rights, the Instant Capacity software calculates the
usage rights consumed by each partition to be the greater of either the actual active or
intended active cores for the partition.
NOTE: Cell boards are assigned to specific partitions and cannot be shared between partitions.
All cores on a cell board are accessible by only the partition to which the cell board is assigned.
Cores on one cell board cannot be shared across multiple partitions.
Unassigning a Cell from a Partition
When a cell is unassigned from a partition in an Instant Capacity system, 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 Figure 6, Figure 7, and
Figure 8 showing 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).
Figure 6 Partition premodification state: Three cells with 2 active and 2 inactive cores in each, and
6 expected inactive cores
Cell 1
AA
II
Cell 2
AA
II
Cell 3
AA
II
Figure 7 Partition postmodification state: Cell 3 is unassigned (total of 6 active cores remaining)
Cell 1
A AA
I
Cell 2
A AA
I
Figure 8 Partition postmodification state: Unassigned Cell 3 with 4 inactive cores
Cell 3
IIII
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 that are distributed among
the remaining cells.
In Figure 9, Figure 10, and Figure 11, 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).
50 Using Instant Capacity to Manage Processing Capacity