Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide

Troubleshooting 6–5
Component Failures
The service and maintenance of a Data Replication Manager solution is based on failure of
subsystem components. When a component fails, you must determine the cause of the
failure, the most appropriate workaround to eliminate down time, and the best course of
action to resolve the problem.
Failure Notification
It is important to understand the operation of the DT subsystem and the individual
component error logging methods that are used to analyze failures on a DT subsystem.
Each component within the DT subsystem provides error and failure information specific
to the function being performed. The array controllers maintain and log specific
information relevant to the operation and the devices connected to both the host ports and
device ports of the controllers. Events, errors, and failures related to a DT subsystem are
provided to the host. Information is available from the HSG80 controller via the serial
maintenance port.
With Data Replication Manager, fault management events that occur on the target
controllers are “passed through” and reported on the initiator controllers. The initiator then
reports these events to the host via Template 90. See the HSG80 Array Controller ACS
Version 8.5 Maintenance and Service Guide for more information.
HSG80 Array Controller Failure
The HSG80 array controller provides event and error reporting via the controller’s serial
maintenance port. To help capture random disk errors associated with the controllers, a
terminal can be connected to this maintenance port. For a complete explanation and
examples of these codes, see the HSG80 Array Controller ACS Version 8.5 Maintenance
and Service Guide.