Users Guide

• Assigning Priority Levels To Servers Using CMC Web Interface
• Assigning Priority Levels To Servers Using RACADM
• Viewing Power Consumption Status
• Viewing Power Budget Status Using CMC Web Interface
• Redundancy Status and Overall Power Health
• Conguring power budget and redundancy
• Executing Power Control Operations
• Executing Power Control Operations on a Server
• Executing Power Control Operations for Multiple Servers Using CMC Web Interface
• Executing Power Control Operations on the IOM
Redundancy Policies
Redundancy policy is a congurable set of properties that determine how CMC manages power to the chassis. The following redundancy
policies are congurable with or without dynamic PSU engagement:
• Grid redundancy
• Power supply redundancy
Grid Redundancy Policy
The purpose of the Grid redundancy policy is to enable a modular enclosure system to operate in a mode in which it can tolerate AC power
failures. These failures may originate in the AC power grid, the cabling and delivery, or a PSU itself.
When you congure a system for Grid redundancy, the PSUs are divided into grids: PSUs in slots 1 and 2 are in the rst grid while PSUs in
slots 3 and 4 are in the second grid. CMC manages power so that if there is a failure of either grid, the system continues to operate without
any degradation. Grid redundancy also tolerates failures of individual PSUs.
NOTE
: One role of Grid redundancy is to provide seamless server operation despite failure of a whole power grid, but the most
power is available to maintain Grid redundancy when the capacities of the two grids are approximately equal.
NOTE: Grid redundancy is only met when the load requirements do not exceed the capacity of the weakest power grid.
Grid Redundancy Levels
One PSU in each grid is the minimum conguration necessary for use as grid redundant. Additional congurations are possible with every
combination that has at least one PSU in each grid. However, to make the maximum power available for use, the total power of the PSUs in
each leg should be as close to equal as practical. The upper limit of power while maintaining Grid redundancy is the power available on the
weakest of the two grids.
If a CMC is unable to maintain Grid redundancy, an e-mail and/or SNMP alert is sent to administrators, if the Redundancy Lost event is
congured for alerting.
In the event of a single PSU not functioning in this conguration, the remaining PSUs in the problematic grid are marked as online. In this
state, the PSUs in the Redundant Grid if not in failed state, help in functioning of the system without interruption. If a PSU stops
functioning, the chassis health is marked non-critical. If the smaller grid cannot support the total chassis power allocations, then Grid
redundancy status is reported as No, and the health of chassis is displayed as Critical.
176
Managing and Monitoring Power