Availability Guide for Change Management

Tools for Online Change
Availability Guide for Change Management–125506
7-4
Considerations and Limitations of SCF
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Tandem TELSERV
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WAN*
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X25AM
Considerations and Limitations of SCF
SCF cannot modify an I/O process while the I/O process is still running. To alter an I/O
process, you must first stop it, alter it, and then restart it. Stopping an I/O process may
affect application availability.
The following subsections describe additional considerations you should be aware of
when using SCF to make changes online.
Considerations for Adding, Deleting, and Altering Objects
The following considerations and limitations apply to adding, deleting, and altering
objects using SCF:
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Not all SCF commands are supported by every communications subsystem.
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The objects and attributes that can be altered, added, or deleted with SCF vary
depending on the communications subsystem.
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SCF does not allow you to change all of the attributes that SYSGENR provides.
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SCF cannot be used to delete objects that were originally configured with
SYSGENR.
Preserving Changes Made With SCF
The new SCF subsystems (KERNEL, SLSA, STORAGE, and WAN) created for G-
series systems differ from the SCF subsystems that exist on D-series systems in the
following ways:
The processes created in the new SCF subsystems are persistent. If the system comes
down, these processes are automatically restarted as soon as the system is loaded. In
contrast, devices and subdevices configured by older SCF subsystems must be
reconfigured after a system load.
If you are managing a D-series system from G-series system, you can use the old SCF
commands and subsystems. The new commands and subsystems, however, have no
meaning on a D-series system.
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This subsystem is controlled by a generic process management process that supports
persistent configuration, which can survive a system load. Generic processes are described
in the SCF Reference Manual for the Kernel Subsystem.
Note. Not all the objects described in this manual are available with the current release of the
operating system. Ask your local Tandem representative about the availability dates for these
objects.