IBM eServer Cluster 1600 Managed by PSSP 3.5: What's New

Chapter 6. Coexistence, migration, and integration 127

6.2.2 Direct migration

We differentiate between two kinds of PSSP migrations. For example, direct

migration is migrating PSSP from 3.4 to 3.5 and AIX from 4.3.3 to 5.1 on a node

in one step. When PSSP 3.1.1 is installed on a node, it is not possible to upgrade

to PSSP 3.5 in a single step. In this case, an intermediate software level of PSSP

must be installed prior to PSSP 3.5. The migration path could be more

complicated if we have other applications based on PSSP, such as LoadLeveler

or GPFS.

AIX migration from Version 4.3.3 to 5.1 needs careful planning because

LoadLeveler and PE versions cannot coexist and interoperate between AIX

levels. For more details, see Figure 6-1 on page 125.

6.2.3 AIX

Let’s investigate AIX 64-bit kernel support and JFS2 file systems from a

coexistence and migration point of view.

64-bit kernel support

Before trying to run a 64-bit kernel on a node, ensure that both the processor and

all the adapters in the node are capable of running in 64-bit mode. Refer to

Appendix D, “AIX device drivers reference” on page 199.

Nodes can be running in 32- or 64-bit kernel mode and coexist with PSSP 3.4

nodes using a 32-bit kernel. It is possible to activate the 64-bit kernel on an AIX

system after initial installation. For detailed instructions, see Example 4-1 on

page 71.

When they are called from within a 64-bit process, 32-bit functions can fail or

cause failures. Because of this, all applications that link to 32-bit libraries must

also be linked in 32-bit mode. Refer to the following list for combinations that

work:

򐂰 32-bit kernel, 32-bit application, 32-bit libraries

򐂰 64-bit kernel, 32-bit-bit application, 32-bit libraries

Attention: Any PSSP 3.1.1 node migrations must be done before migrating

the CWS to PSSP 3.5 because PSSP 3.5 is not supported in coexistence with

PSSP 3.1.1. In 3.5, PSSP 3.1.1 was removed from the SMIT panels.

Note: 64-bit applications for AIX 4.3.3 need to be recompiled to run on 64-bit

AIX 5.