Specifications

4–48 Planning Storagesets
■ If you previously configured storagesets with the SAVE_CONFIGURATION
option, you do not need to initialize them again after you reconfigure your
devices with a new controller.
■ When you replace a controller, make sure the replacement controller does not
contain any configuration data. If the controller is not new, use the
CONFIGURATION RESET command to purge any existing configuration. If
you do not take this precaution, you can lose configuration data if non-volatile
memory changes.
Saving Configuration Information in Dual-Redundant
Configurations
If you decide to use the SAVE_CONFIGURATION switch in a dual-redundant
configuration, keep these points in mind:
■ The controller-unique data for both controllers is saved.
■ Saved configuration data from a dual controller configuration can be used to
restore the configuration to a replacement controller. However, if one controller
in a dual configuration is replaced, use the SET FAILOVER COPY= command
to restore the configuration.
■ When replacing both controllers, you can replace the first and restart it alone by
holding in port button 6 and simultaneously pressing the reset button on the
controller’s operator control panel. (This controller picks up any previously saved
configuration data on disk and uses it to set up the subsystem configuration.)
Replace the second controller using the SET FAILOVER COPY= command to
copy the configuration information from the operating controller.
■ Both controllers update the saved data; each writes to only those devices
currently preferred to it. This prevents conflicting data transfer.
See “INITIALIZE,” page 7–62 for more information on saving the configuration.