You can use the Integrated Virtualization Manager to add paging space devices to or remove paging space
devices from the shared memory pool. You can perform these tasks only
if the managed system supports the PowerVM® Active Memory™ Sharing technology
for using shared memory.
A paging space device is a logical volume or physical volume
that, when assigned to a logical partition that uses shared memory,
the management partition can use to provide paging space for the partition.
The Integrated Virtualization Manager (IVM) automatically creates
and manages paging space devices from the paging storage pool that
you defined for the shared memory pool. This is the case as long as
the paging storage pool that you defined is of a sufficient size to
meet the needs of the shared memory partitions that you create. Consequently,
you generally do not need to manage paging space devices on the system,
unless you want to specify physical volumes for shared memory partitions
to use for paging spaces.
For example, when you use the Create Partition
Wizard to create a logical partition that uses shared memory, the
wizard creates and assigns a paging space device of an appropriate
size for the new partition from the paging storage pool. This is also
the case, for example, when you change the memory mode of a partition
to use shared memory. The process is different, however, if you define
your own paging space devices for the shared memory pool. When you
define a specific paging space device, the wizard assigns this paging
space device to the next logical partition that you create that uses
shared memory, as long as the paging space device is of a sufficient
size to meet the needs of the new partition.
Use any role other
than View Only to perform this task. The View Only role can view the
properties, but it cannot change them.
Before you
add a
paging space device to the shared memory pool, you must meet the
following prerequisite conditions:
- A shared memory pool must be defined for the system.
- The logical volume or physical volume that you want to use as
a paging space device must not be in use for another purpose. When
you add either a logical volume or a physical volume as a paging space
device, it is dedicated to providing this function and is no longer
available for any other purpose.
- For the Integrated Virtualization Manager to assign the paging space device to a shared memory partition successfully,
the logical volume or physical volume that you select to use as a
paging space device must meet the following requirements:
- For AIX® or Linux shared memory partitions,
the size of the paging space device must be greater than, or equal
to, the size specified for the maximum memory attribute for the partition
that uses the paging space device.
- For IBM® i shared memory partitions,
the size of the paging space device must be greater than, or equal
to, the size specified for the maximum memory attribute for the partition,
multiplied by 129/128, which is the mathematical equivalent for adding
an extra 1 bit for every 16 bytes.
Before you
remove a paging space device from the
shared memory pool, you must meet the following prerequisite conditions:
- Ensure that the paging space device that you want to remove is
not assigned to a logical partition. You cannot remove a paging space
device if it is assigned to a logical partition.
- Ensure that the paging space device that you want to remove is
not active.
To add a paging space device to or remove a paging space
device from the shared memory pool, complete the following steps in
the Integrated Virtualization Manager:
- From the navigation area, select View/Modify
Shared Memory Pool under Partition Management.
- Expand Paging Space Devices - Advanced.
- To add a paging space device, complete these steps:
- Click Add. A table
appears that lists the available logical volumes and physical volumes
on the managed system.
- Select the logical or physical volume that you want
to act as a paging space device, and click OK. The device that you selected is shown in the Paging
Spaces table.
- To remove a paging space device, complete these steps:
- Select the paging space device that you want to remove,
and click Remove.
- Click OK to confirm the removal.
Note: If the paging space device is assigned to a logical partition,
you cannot remove it.
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