Dynamic LPAR allows hardware resources to be moved between logical
partitions. Use this topic to learn about dynamic LPAR and how it helps to
create a virtual computing environment.
The introduction of logical partitioning has expanded the options for deploying
applications and workloads. Logical partitioning provides more flexibility
by making it possible to run multiple, independent operating system images
concurrently on a single server. Dynamic LPAR allows partition resources to
be moved from one logical partition to another without requiring a reboot
of the system or affected partitions. The following are some example situations
in which dynamic LPAR is useful:
- Move processors from a test partition to a production partition in periods
of peak demand, then move them back again as demand decreases.
- Move memory to a partition that is doing excessive paging.
- Move an infrequently used I/O device between partitions, such as a CD-ROM
for installations, or a tape drive for backups.
- Release a set of processor, memory, and I/O resources into the free pool,
so that a new partition can be created from those resources.
- Configure a set of minimal logical partitions to act as backup to primary
logical partitions, while also keeping some set of resources available. If
one of the primary logical partitions fails, you can assign available resources
to that backup logical partition so that it can assume the workload.
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