Users Guide

• Server Slot Power Priority Settings
• Viewing Power Consumption Status
• Viewing Power Budget Status
• Redundancy Status and Overall Power Health
• Conguring power budget and redundancy
• Executing Power Control Operations
Related links
Redundancy Policies
Dynamic Power Supply Engagement
Default Redundancy Conguration
Power Budgeting For Hardware Modules
Viewing Power Consumption Status
Viewing Power Budget Status
Redundancy Status and Overall Power Health
Conguring power budget and redundancy
Executing Power Control Operations
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
• No 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 power
failures. These failures may originate in the input 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, 2, and 3 are in the rst grid while PSUs
in slots 4, 5, and 6 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
: Grid Redundancy provides seamless server operation despite failure of a whole power grid. Hence, the maximum 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
To congure Grid Redundancy, at least one PSU must be present in each grid. 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 grid
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. The following gure illustrates 2 PSUs per grid and a power failure on grid 1.
If CMC is unable to maintain Grid Redundancy, an email or SNMP alerts are sent to administrators if the Redundancy Lost event is
congured for alerting.
Managing and Monitoring Power
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