Watch Feature - HP 9000 Installation And Configuration Manual

Dual Interface Configurations
Affecting Port Mode
NOTE
62
All ZLUs on a given port must be disabled before the port mode can be
changed.

watch Feature

The watch feature provides a heartbeat mechanism between the ACC
MUX card and the host system in which it is installed. Any card which
has the MONITOR protocol configured will place all of its ports into
loopback mode when a heartbeat is no longer being received from the
host system. This would occur, for example, if the system were to panic.
Note that the use of the watch mechanism has specific configuration
requirements. Refer to the ACC Utilities Reference Guide for complete
details.
Chapter 4