Specifications

60 IBM Power 770 and 780 Technical Overview and Introduction
It is possible to check whether the Memory Mirroring option is enabled and change its current
status via HMC, under the Advanced Tab on the CEC Properties Panel (Figure 2-15).
Figure 2-15 CEC Properties window on an HMC
After a failure on one of the DIMMs containing hypervisor data occurs, all the server
operations remain active and the service processor will isolate the failing DIMMs. Because
there are no longer eight functional DIMMs behind a memory controller, Active Memory
Mirroring will not be available until this DIMM is replaced. Systems will stay in the partially
mirrored state until the failing DIMM is replaced.
2.4 Capacity on Demand
Several types of Capacity on Demand (CoD) are optionally available on the Power 770 and
Power 780 servers to help meet changing resource requirements in an on demand
environment by using resources that are installed on the system but that are not activated.
2.4.1 Capacity Upgrade on Demand (CUoD)
CUoD allows you to purchase additional permanent processor or memory capacity and
dynamically activate them when needed.
2.4.2 On/Off Capacity on Demand (On/Off CoD)
On/Off Capacity on Demand allows you to temporarily activate and deactivate processor
cores and memory units to help meet the demands of business peaks such as seasonal
activity, period-end, or special promotions. When you order an On/Off CoD feature, you
receive an enablement code that allows a system operator to make requests for additional
processor and memory capacity in increments of one processor day or 1 GB memory day.
The system monitors the amount and duration of the activations. Both prepaid and post-pay
options are available.