HP Instant Capacity User's Guide for Versions 8.x

Assigning a Cell to a Partition
A cell can be assigned to a partition only if there are sufficient cell usage rights available across
the complex, as well as sufficient memory usage rights to enable activation of all the memory on
the cell, and sufficient usage rights for at least one core of the cell to be active.
When a cell is assigned to a partition in an Instant Capacity system, depending on the number
of core usage rights available in the system when the cell is assigned, the number of intended
active cores for the partition automatically changes. The following example of a single partition
with one assigned and one unassigned cell illustrates this:
Figure 4-2 Partition pre-modification state: One cell assigned with 3 active and 1 inactive cores,
and available usage rights for 2 additional cores
A
Active Core
Inactive (iCAP) Core
Cell 1
AAA
Available Core
Usage Rights
UR UR
I
I
Figure 4-3 Pre-modification state: Unassigned cell with 4 inactive cores without usage rights
Cell 2
II I I
Figure 4-4 Partition post-modification state: Cell 2 assigned to partition
Cell 1
AAA
I
Cell 2
AA
II
When Cell 2 is assigned to the partition, the number of intended active cores for the partition is
automatically changed to 5. When the partition is rebooted, 5 cores in the partition are activated.
When an unassigned cell is assigned to a partition via the parmodify command, the Instant
Capacity software determines the number of available core usage rights in the complex and will
use this number to activate as many cores as possible in the new cell. (This number will typically
correspond to the icapstatus value for Additional cores that can be activated
with current usage rights or the actual number of cores, whichever is smaller. This value
must be nonzero in order to be able to assign an inactive cell to a partition.)
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 will
automatically be assigned to these new cells. See also “New Partition Creation and Instant
Capacity” (page 174).
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.
Assigning a Cell to a Partition 65