Limits And Restrictions - IBM RS/6000 SP Handbook

Two licenses for IBM C for AIX Version 3.6.6 or later or the batch C and C++
Version 3.6.6 or later compilers and runtime libraries of VisualAge C++
Professional Version 4.0 for AIX or later. If the compiler's license server is on
the control workstation, the backup control workstation should also have a
license server with at least one license. If there is no license server on the
backup control workstation, an outage on the primary control workstation will
not allow the SP system access to a compiler license.
Two licenses and software sets for High Availability Cluster Multi-Processing
for AIX (HACMP). HACMP Version 4.4 is required for AIX Version 4.3.3 and
PSSP Version 3.2. Both the client and server options must be installed on
both control workstations. You must purchase two licenses.
PSSP 3.2 optional component HACWS. This is the customization software
that is required for HACMP support of the control workstation. It comes with
your order of PSSP 3.2 as an optionally installable component. Install a copy
on both control workstations.

7.3.3 Limits and restrictions

The HACWS support has the following limitations and restrictions:
You cannot split the load across a primary and backup control workstation
either the primary or the backup provides all the functions at one time.
The primary and backup control workstations must each be a pSeries or an
RS/6000 system. You cannot use a node at your SP as a backup control
workstation.
The backup control workstation cannot be used as the control workstation for
another SP system.
The backup control workstation cannot be a shared backup of two primary
control workstations.There is a one-to-one relationship of primary to backup
control workstations; a single primary and backup control workstation
combination can be used to control only one SP system.
If your primary control workstation is a PSSP Kerberos V4 authentication
server, the backup control workstation must be a secondary authentication
server.
If you plan to have DCE authentication enabled, you cannot use HACWS. If
you already use HACWS, do not enable DCE authentication.
HACWS does not tolerate IPV6 aliases for IPV4 addresses.
224 RS/6000 SP and Clustered IBM ^ pSeries Systems Handbook