If the retry is successful, a recovery is used to reactivate the resource. Error
recovery attempts performed by the MOSS are:
Automatic scanner dump and re-IML
Automatic CCU dump and re-IPL
Automatic MOSS dump and re-IML
Automatic TIC dump.
For example, if the MOSS is operational and a failure occurs in the CCU or its
storage, or if there is a control program abend, the MOSS triggers an automatic
re-IPL of the 3745. There is an automatic dump and an automatic loading of the
active load module stored on the MOSS disk if the automatic IPL option has been
chosen. Otherwise, the network operator can reload the control program from the
host and, if required, take a dump.
If the MOSS is disabled and remains disabled, all communication functions of the
3745 continue, but no maintenance functions can be run. The 3745 control
program cannot be reloaded.
If a line adapter is disconnected, the controller continues to operate with the other
adapters. The MOSS provides an automatic dump of the disconnected adapter
and attempts to re-IML it. If it remains inoperative, the user can move the lines to
another adapter via the port swapping function.
If a channel adapter is disabled, that route to a host is inoperative.
When the line status given by the portable keypad display or host messages
indicates poor condition of the lines connected to a LIC 5 or 6, the LIC 5 or 6 can
run at its backup speed. This applies also in the case of temporary line problems.
The impact of line degradation is reduced at slower speed. When normal line
conditions resume, the full speed can then be reset. In the case of continuous line
problems, the lines should be disabled.
After a power off/power on, the LIC 5 or 6 will operate at its default speed, which is
usually the full speed. Thus, if the LIC 5 or 6 is running at its backup speed, the
operator should redefine it at the next power on.
The retry is not successful when the failing function cannot be corrected or when
the retry threshold is exceeded. The error is analyzed and notification is sent to the
operator (by an alarm or alert). In this case, there is a hardware or microcode error
or a faulty element. The failed resource is inhibited, or the faulty element is
repaired or replaced.
Controller Retry/Recovery
Network-Level Action
Automatic CCU re-IPL
Dynamic reconfiguration
Automatic or selective
scanner IML
Network resource reactivation
(NetView program)
MOSS IML
None
Chapter 5. Problem Determination
5-5
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