Configuring and Managing Host-Based X.25 Links - Edition 5 (36939-90054)

Chapter 7 137
Managing Networks with DTCCNTRL
Dynamic Configuration
Dynamic Configuration
Dynamic Configuration enables you to change the configuration of the
DTS subsystem by applying the configuration changes made in
NMMGR without rebooting the system. Such configuration changes
include adding or deleting ldevs, adding or deleting DTCs, modifying
most parameters of profiles, or DTCs, changing the number of
non-nailed ldevs. See for a complete list of changes that can be made
dynamically. (Some changes will require additional action, such as
resetting the DTC, before the change is completed.)
NMMGR can keep up to 70 changes. This means that you can change a
maximum of 70 different screens before you invoke DTCCNTRL. After
the 64th change NMMGR displays a warning that tells you the limit is
near. If more than 70 changes are made NMMGR warns that the
current change will not take effect using DTCCNTRL. Those changes
made after 70 entries will not be kept and can not be made dynamically.
After DTCCNTRL is invoked and the changes were successful, NMMGR
can again keep up to 70 new changes. Those changes that were not
successful will be saved so they can be retried at a later time. When a
new DTC is added NMMGR considers this to be one change even if you
save data on many screens to configure this DTC.
All operations that delete ldevs are non-destructive. This means that if
an ldev to be deleted is in use, then the delete is not performed. You
must take the appropriate action to free the device. For example, you
must stop the spooler on a spooled serial printer or log off the session on
a terminal ldev. If multiple ldevs are deleted, then only free ldevs are
deleted. Those ldevs that were not free will be processed again the next
time DTCCNTRL is invoked.
Some changes may affect more than one user. Usually this may happen
when the change is to a DTC characteristic such as adding a card. This
is because the DTC will need to be powered off or reset. Users on other
DTCs are not affected.
Some changes will require additional steps to complete once DTCCNTRL
has made the desired changes. These possible additional steps are:
logoff any sessions or close any jobs that access the changed devices,
stop and restart the spooler if the device is a printer, stop and the start
X.25/PADSUP, reboot or reset the DTC. DTCCNTRL will display a
message when these steps are necessary and tell you which DTCs are
affected.
Refer to Table 7-1 for a list of configuration changes that can be
modified dynamically.