OSI/FTAM Configuration and Management Manual

Planning, Installing, and Configuring Tandem FTAM
OSI/FTAM Configuration and Management Manual—421944-001
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Allocating Resources
Primary and Backup Processors for Initiator and Responder
Processes
The CPU and BACKUPCPU attributes of the PROCESS object specify the processors
on which the primary and backup processes run. If you specify a primary processor
when you use the TACL RUN command to create the APLMGR process, the primary
processor becomes the default processor when you create processes managed by that
APLMGR process. To override this default for an initiator or a responder process, you
can specify values for the CPU attribute in the ADD PROCESS command for that
initiator or responder. For example, to specify that the responder process $FTR2 is to run
its primary process in CPU 3 and its backup process in CPU 6, you could configure the
process with the following command:
ADD PROCESS $AMGR.#FTAMR.FTR2, NAME $FTR2, &
PROFILE $AMGR.#VFS.VFS1, CPU 3, BACKUPCPU 6
By specifying a backup processor for a process, you create a NonStop process pair. If
the primary processor goes down, the process on the backup processor takes over.
However, all associations are lost and the state of any files that were being written is
unknown. You will have to start the process again and reestablish terminated
associations. You cannot specify the same processor as both the primary and backup
processor. If you do this, the APLMGR process will reject your request to add the
process.
To maintain maximum system efficiency and avoid excessive downtime, it is advisable
to distribute processes over the resources available on the system. Such distribution of
processes, or load balancing, speeds up disk access and promotes system longevity. You
must also take into account OSI/AS subsystem parameters, such as the processors in
which OSI/AS processes run, when considering where to locate the FTAM processes.
See the OSI/AS Configuration and Management Manual for additional details.
Location of Process Swap Volume
Another PROCESS object attribute, SWAP, allows you to specify a disk on which a
process can keep its swap file. The ideal location to specify as the swap disk is a disk
with little or no activity and with a large amount of available space. If you try to
configure an FTAM process and receive an error code indicating that there is insufficient
swap space, use the ALTER PROCESS command to specify a less fully occupied disk
as the swap disk.
This attribute defaults to the disk where the process code file resides. To specify a
different disk, for example, $DATA2, you could configure the process with the
following command:
ADD PROCESS $AMGR.#FTAMR.FTR2, NAME $FTR2, &
PROFILE $AMGR.#VFS.VFS1, SWAP $DATA2
Note. There is no default for a backup processor. If you do not specify the BACKUPCPU
attribute when you add an initiator or a responder process, the process will not run as a
process pair.