The following table describes the situations
in which you can change a paging VIOS partition.
Table 1. Changing paging VIOS partitionsState of one paging VIOS partition |
State of the other paging VIOS partition |
Change options |
Running or shut down |
None. Only one paging VIOS partition is assigned
to the shared memory pool. |
You can change the VIOS assignment of the
paging VIOS partition. In this situation, you also need to add the
paging space devices to which the changed paging VIOS partition has
access. |
Running |
Running |
You can change the VIOS assignment of one
of the paging VIOS partitions. You cannot change the VIOS assignment
of both paging VIOS partitions at the same time. |
Running |
Shut down |
You can change the VIOS assignment of only
the paging VIOS partition that is shut down. |
Shut down |
Running |
You can change the VIOS assignment of only
the paging VIOS partition that is shut down. |
Shut down |
Shut down |
You cannot change the VIOS assignment of
either paging VIOS partition. Instead, you can remove the paging VIOS
partition that you do not want to change and then change the VIOS
assignment of the remaining paging VIOS partition. In this situation,
you also need to add the paging space devices to which the changed
paging VIOS partition has access. |
When you change the VIOS assignment of
a paging VIOS partition, the following configuration changes occur
to the paging space devices:
- Paging space devices that were common become independent if only
one paging VIOS partition can access them.
- Paging space devices that were common remain common if both paging
VIOS partitions can access them. (These are paging space devices to
which all three VIOS logical partitions have access. The three VIOS
logical partitions are the two VIOS logical partitions that were originally
assigned to the shared memory pool as paging VIOS partitions plus
the VIOS logical partition that you assigned as a paging VIOS partition
when you changed the VIOS assignment of a paging VIOS partition.)
- Paging space devices that were independent become common if both
paging VIOS partitions can access them.
When you change the VIOS assignment of a
paging VIOS partition, the HMC changes
the configuration of the shared memory partitions to use the VIOS
logical partition that you assign as the paging VIOS partition. When
you activate the shared memory partition, the HMC automatically reflects
the name of the VIOS logical partition that you assigned as the paging
VIOS partition in the partition profile. The following examples explain
this automatic change in more detail:
- A shared memory partition uses only one paging VIOS partition
and you change the VIOS assignment of that paging VIOS partition from
VIOS_A to VIOS_B. When you activate the shared memory partition, the HMC automatically shows
VIOS_B as the paging VIOS partition in the partition profile.
- Two paging VIOS partitions are assigned to the shared memory pool.
VIOS_A is assigned to the shared memory pool as PVP1 and VIOS_B is
assigned to the shared memory pool as PVP2. A shared memory partition
uses PVP1 as the primary paging VIOS partition and PVP2 as the secondary
paging VIOS partition. You change the VIOS assignment of PVP1 from
VIOS_A to VIOS_C. When you activate the shared memory partition, the HMC automatically shows
VIOS_C as the primary paging VIOS partition and VIOS_B as the secondary
paging VIOS partition.
To change the Virtual I/O Server logical partitions
that are assigned to the shared memory pool as
paging VIOS partitions, complete the following steps from the HMC:
After you change the VIOS assignement of a paging VIOS partition
that is assigned to the shared memory pool, complete the following
steps:
- If necessary, assign paging space devices to the
shared memory pool. For instructions, see Adding and removing paging space devices to and from the shared memory pool. You might need to add paging
space devices in the following situations:
- You changed the VIOS assignment of the only paging VIOS partition
that is assigned to the shared memory pool. The
VIOS logical partition that you assigned as the paging VIOS partition
has access to different paging space devices than the VIOS logical
partition that was previously assigned as the paging VIOS partition. The paging space devices to which the current paging
VIOS partition has access must be assigned to the shared memory pool
for the shared memory partitions to use them.
- You removed a paging VIOS partition that was shut down and then
changed the VIOS assignment of the other paging VIOS partition that
was also shut down. Because you removed a paging VIOS partition from
the shared memory pool, you changed the VIOS assignment of the only
paging VIOS partition that is assigned to the shared memory pool. The
VIOS logical partition that you assigned as the paging VIOS partition
has access to different paging space devices than the VIOS logical
partition that was previously assigned as the paging VIOS partition. The paging space devices to which the current paging
VIOS partition has access must be assigned to the shared memory pool
for the shared memory partitions to use them.
- You changed the VIOS assignment of a paging VIOS partition that
provided independent paging space devices to shared memory partitions. The
VIOS logical partition that you assigned as the paging VIOS partition
has access to different paging space devices than the VIOS logical
partition that was previously assigned as the paging VIOS partition. The independent paging space
devices to which the current paging VIOS partition has access must
be assigned to the shared memory pool for the shared memory partitions
to continue to use independent paging space devices.
- Activate all of the shared memory partitions that
you previously shut down so that the changes that you made can take
effect. For instructions, see Activating a logical partition.