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Configuration parameters
PLM has four parameters for each managed resource that control how PLM adds
and removes memory and processors to and from a partition. These are shown
in Table 6-1.
Table 6-1 PLM configuration parameters
Parameter Min Default Max Description
Memory minimum - - - The minimum memory capacity of the partition. PLM
will never leave a partition with less than this amount.
Defaults to HCM value.
Memory guaranteed - - - The guaranteed amount of memory. Defaults to HCM
desired value.
Memory maximum - - - The maximum amount of memory resources PLM will
allow a partition to have. Defaults to HCM value.
Memory shares 0 1 255 A factor used to specify how memory capacity in
excess of the memory guaranteed is distributed to
partitions in the group. Specifying a value of 0
indicates that a partition will never receive more than
the guaranteed memory.
CPU minimum - - - The minimum CPU capacity of the partition. PLM will
never leave a partition with less than this amount.
Defaults to HCM value.
CPU guaranteed - - - The guaranteed amount of CPU whenever a partition’s
load is greater than the CPU load average low
threshold. Defaults to HCM desired value.
CPU maximum - - - The maximum amount of CPU resources PLM will
allow a partition to have. Defaults to HCM value.
CPU Shares 0 1 255 A factor used to specify how CPU capacity in excess
of the CPU guaranteed is distributed to partitions in the
group. Specifying a value of 0 indicates that a partition
will never receive more than the guaranteed CPU.
What is the difference between guaranteed and minimum?
PLM will ensure that a partition has the guaranteed resources whenever the
partition load is greater than the low resource usage threshold. When the
resource utilization is less than this limit, the partition becomes a donor and
PLM will remove resources until the minimum, hard-limit, is reached.
Chapter 6. Partition Load Manager 391