HP StorageWorks HSG80 ACS Solution Software V8.8 for Novell NetWare Installation and Configuration Guide (AA-RV1MA-TE, March 2005)

Planning a Subsystem
39HSG80 ACS Solution Software V8.8 for Novell NetWare Installation and Configuration Guide
Enabling Mirrored Caching
In mirrored caching, half of each controller’s cache mirrors the companion
controller’s cache, as shown in Figure 11.
The total memory available for cached data is reduced by half, but the level of
protection is greater.
Figure 11: Mirrored caching
Before enabling mirrored caching, make sure the following conditions are met:
■ Both controllers support the same size cache.
■ Diagnostics indicate that both caches are good.
■ No unit errors are outstanding, for example, lost data or data that cannot be
written to devices.
■ Both controllers are started and configured in failover mode.
What is the Command Console LUN?
The Command Console is not supported with version 8.8-1 of the HSG80 ACS
Solution Software. Please see Chapter 4 for replacement options.
Determining Connections
The term “connection” applies to every path between a Fibre Channel adapter in a
host computer and an active host port on a controller.
Cache module A Cache module B
A
cache
Copy of
B
cache
Copy of
A
cache
B
cache
CXO5729A