Special Considerations
Instant Capacity Integration with Virtual Partitions
Integrated Virtual Partition Environment
Activation and Deactivation of Processors
When using vPars version A.04.01 or greater, the icod_modify command must be used to modify processor capacity when you are making any adjustment to an nPartition or to multiple nPartitions:
•When you execute the icod_modify command to deactivate a processor, a check is made to see if the request can be satisfied. If so, the local hard partition’s intended active number is decreased and the appropriate number of processors are removed from the local virtual partition.
•When you execute the icod_modify command to activate a processor, a check is made to see if the request can be satisfied. If so, the local hard partition’s intended active number is increased and the appropriate number of processors are added to the local virtual partition.
If you are adjusting processor assignments across virtual partitions in a single nPartition, you use the vparmodify command for the best coordination between the Instant Capacity software and the vPars software, and for optimized performance. The vparmodify command is the fastest and most efficient way to adjust capacity within virtual partitions of a single hard partition, but it does not affect the intended active count for the nPartition and it therefore cannot be used to migrate unused capacity either to or from other nPartitions:
•When you execute the vparmodify command to deactivate a processor, there is no authorization required from the Instant Capacity software.
•When you execute the vparmodify command to activate a processor, it checks with the Instant Capacity software to determine how many processors are available for activation. This number is calculated as the difference between the local hard partition’s intended active number and the total number of processors assigned to the vPars database. If enough processors are available to meet the request, the proper number of processors are added to the local virtual partition.
Whether you are activating or deactivating processors, the vparmodify command adjusts only the number of dynamic processors, and it does not explicitly identify specific processors.
Appendix A | 135 |