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IBM Power 750 and 760 Technical Overview and Introduction
Dynamic adjustment of reserved pool capacity
The reserved pool capacity of a shared processor pool, other than the default shared
processor pool
0
, can be adjusted dynamically from the managed console, by using either the
graphical interface or the CLI.
Dynamic movement between shared processor pools
A micropartition can be moved dynamically from one shared processor pool to another using
the managed console using either the graphical interface or the CLI. Because the entitled
pool capacity is partly made up of the sum of the entitled capacities of the micropartitions,
removing a micropartition from a shared processor pool reduces the entitled pool capacity for
that shared processor pool. Similarly, the entitled pool capacity of the shared processor pool
that the micropartition joins will increase.
Deleting a shared processor pool
Shared processor pools cannot be deleted from the system. However, they are deactivated by
setting the maximum pool capacity and the reserved pool capacity to zero. The shared
processor pool will still exist but will not be active. Use the managed console interface to
deactivate a shared processor pool. A shared processor pool cannot be deactivated unless all
micropartitions hosted by the shared processor pool have been removed.
Live Partition Mobility and multiple shared processor pools
A micropartition can leave a shared processor pool because of PowerVM Live Partition
Mobility. Similarly, a micropartition can join a shared processor pool in the same way. When
performing PowerVM Live Partition Mobility, you are given the opportunity to designate a
destination shared processor pool on the target server to receive and host the migrating
micropartition.
Because several simultaneous micropartition migrations are supported by PowerVM Live
Partition Mobility, it is conceivable to migrate the entire shared processor pool from one server
to another.
3.4.4 Virtual I/O Server
The Virtual I/O Server is part of all PowerVM editions. It is a special-purpose partition that
allows the sharing of physical resources between logical partitions to allow more efficient
utilization (for example, consolidation). In this case, the Virtual I/O Server owns the physical
resources (SCSI, Fibre Channel, network adapters, and optical devices) and allows client
partitions to share access to them, thus minimizing the number of physical adapters in the
system. The Virtual I/O Server eliminates the requirement that every partition owns a
dedicated network adapter, disk adapter, and disk drive. The Virtual I/O Server supports
OpenSSH for secure remote logins. It also provides a firewall for limiting access by ports,
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