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

member, the usage rights will automatically be restored (reassigned) to the member partition
(or complex, in the case of unassigned seized rights) from which they were seized. However,
note that if the seized usage rights have been redeployed to other members and are not released
at the expiration time, the group may go out of compliance or temporary capacity may be used
to maintain compliance.
If any partition of the inaccessible member from which rights seizures were deferred reconnects
to the group before the expiration date, the seized core usage rights (for all partitions) are finalized
as a “loan” from the member to the group, the expiration date is no longer relevant, and the
usage rights can thereafter be manipulated with normal icapmodify operations.
Instant Capacity version 8.02.01 or later is required on all Group Managers and version 8.02 or
later is required on all hosts in the GiCAP member in order to seize usage rights from a completely
unreachable complex. The icapmanage -x operation can be performed once for each hard
partition on the member.
Down Partitions with Powered-On Cells
Partitions that are not running an iCAP daemon may be assumed to be using all cores on cells
configured in the partition. The Instant Capacity software can avoid this assumption when all
cells configured in the partition are powered down. Because of this, cells in partitions from which
usage rights have been seized should be rebooted or made inactive within 12 hours. If this is not
done, the partition may begin to consume temporary capacity. If temporary capacity is not
available, the complex may no longer be in compliance with the Instant Capacity contract. Cells
may be made inactive by removing them from the partition, shutting down the partition from
within the OS by using shutdown -R -H, or with the MP RR command.
Other Considerations
Rights seizure can be used as part of an automatic failover system, but care must be exercised
to make sure resources are seized appropriately and in a manner which will not cause problems
when the problem is corrected. The Instant Capacity software determines that the partition is
down based on whether the ping command is unsuccessful for the partition. There are some
circumstances where ping may be unsuccessful but the system remains functional (for example,
if a network connection is interrupted). In this case, rights seizure may be inappropriate and
leave workloads without the necessary resources.
Rights Seizure 117