Specifications

164 IBM Power 770 and 780 Technical Overview and Introduction
The Active Memory Mirroring can be disabled or enabled on the management console using
the Advanced tab of the server properties (Figure 4-5).
Figure 4-5 Enabling or disabling active memory sharing
The system must be entirely powered off and then powered on to change from mirroring
mode to non-mirrored mode.
This same frame also gives informations about the mirroring status:
򐂰 Desired mirroring mode: Takes the values “Off” or “System firmware only”
򐂰 System firmware mirroring status
– Fully mirrored: The mirroring is completely functional.
– Partially functional: Due to uncorrectable memory failures, some of the hypervisor
elements or objects are not mirrored. The system remains partially mirrored until DIMM
is replaced and the system is rebooted.
– Not mirrored: At the last power on of the system, the desired state was “mirroring off.’
򐂰 Mirrorable memory: Total amount of physical memory that can be mirrored, which is
based on the DIMMs that are plugged
򐂰 Mirrored memory in use
򐂰 Available mirrored memory