OSI/FTAM Configuration and Management Manual

Planning, Installing, and Configuring Tandem FTAM
OSI/FTAM Configuration and Management Manual—421944-001
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Controlling System Performance
Regeneration of Subdevices
Each FTAM subdevice services a particular association through an FTAM initiator or
responder. When an initiator or responder process completes an association and no
longer requires the subdevice, the process discards the subdevice. Each initiator process
creates its own subdevices as it receives requests for associations, using subdevice
names furnished to it by the APLMGR process. Responder processes have the number
of subdevices specified by the MAXATTACH attribute and may or may not
automatically regenerate new subdevices when the process discards a subdevice. The
ALLOWSU attribute of the PROCESS object allows you to specify whether a responder
process should automatically generate a new subdevice and post a new attach once a
subdevice has been discarded. The default value of ALLOWSU is ON.
Changing the ALLOWSU attribute to OFF allows the responder to maintain its current
associations over OSI/AS and to use pending subdevices and attaches, but prevents
further associations from being established after the currently existing subdevices are
used. The most likely situation in which you would want to prevent new associations
from being established is when you want to stop a responder process gracefully—that is,
after it has completed its current work. Unlike other PROCESS attributes, this attribute
can be changed while the process is running and handling associations (that is, while it
is in the STARTED state).
For example, to stop the responder process $FTR2 without interrupting any associations
in progress, issue the following command:
ALTER PROCESS $AMGR.#FTAMR.FTR2, ALLOWSU OFF
After you issue the command, you can wait until no more subdevices exist for $FTR2,
and then stop the process.