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

6–6 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
SWCC Failure
SWCC notifies the user of any component loss in the system via an active SWCC Client
Graphical User Interface (GUI). This GUI window on the command console monitor is a
graphical representation of the controllers and their physical and logical storage elements.
SWCC periodically queries the controllers for status. Clients connected to the GUI .ini file
will be notified via the GUI screen of any changes in status. The user is able to manipulate
controllers and storage through the GUI and intervene in the DT process when there is a
problem.
Refer to the StorageWorks Command Console Getting Started Guide and the on-line users
help for more information.
Failure of One Member in a Dual Redundant Controller Pair
Each of the controller pairs can lose a single member to failure. When this happens, a
normal controller failover occurs automatically, and the preferred devices will
automatically be moved to the remaining controller. A decrease in I/O speed may occur.
The faulty controller must be replaced using conventional controller troubleshooting
techniques.
NOTE: It is not possible to set up a DT configuration unless both controllers are
operational.
Failure of Both Fiber Optic Cables or Switch
If you are operating in failsafe mode and both links between the initiator and target sites
are lost, the remote copy set is put into failsafe locked mode. If you are operating in
normal mode, then I/O will continue through the initiator host, and the target will still be
removed.
If you lose the fiber optic cable connection of a switch at either site, refer to Figure 6–1 for
information on how to resolve the problem.