AM3270 Management Programming Manual

EVENT MANAGEMENT
-1: ZCOM-EVT-CPU-SWITCH
ZCOM-TKN-CAUSE-CPU-SWITCH is the reason the CPU was switched to
the backup CPU. It corresponds to the value of reason in the
message text. The possible values are:
Value Corresponding Text
ZCOM-VAL-OP-REQ OPERATOR REQUESTED
ZCOM-VAL-HW of HARDWARE OR LOW LEVEL
SOFTWARE PROBLEM
ZCOM-VAL-TAKOVR TAKEN OVER BY PRIMARY
Volatile Tokens
ZEMS-TKN-CU is a standard EMS token that contains the controller
and unit number. This token is present in the event buffer only
if the controller uses subchannel-type I/O addressing.
Event-Message Text
In the message text, ldev corresponds to the value of ZEMS-TKN-
LDEV, n,n,%nn,%nnn corresponds to the value of ZEMS-MAP-EXIOADDR,
ldevname corresponds to the value of ZEMS-TKN-LDEVNAME, cpu1
corresponds to the value of ZCOM-TKN-OLD-CPU, cpu2 corresponds
to the value of ZCOM-TKN-NEW-CPU, and reason corresponds to the
value of ZCOM-TKN-CAUSE-CPU-SWITCH.
Probable Cause
The AM3270 I/O process switches to the backup CPU as a result
of a SWITCH command or as a result of a software or hardware
error. The SWITCH command can be issued programmatically or
interactively. See Section 6, "Commands and Responses" for a
description of the programmatic SWITCH command.
Recommended Action
If a command caused the switch, no action is necessary. If not,
note the reason code and contact your Tandem representative.
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