Supermicro 8U SuperBlade, User Manual

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5-5
Chapter 5: Power Supply Modules
3. Pull out the handle and remove the unit: the two-piece handle locks into the closed
position. To release the handle, squeeze together the two metal plates of the handle
with your thumb and fingers and then pull out.
5-2 Redundant Power Supplies
Each blade enclosure can hold up to four power supplies. Installing all four power
supplies may provide you with redundant power – depending upon the number of blades
in the enclosure, the model and power level of the power supplies installed and the
power load from modules in your system. In most blade enclosure systems power
supplies may be redundant and therefore provide backup in case of power supply
failure. The configuration for power redundancy is created using the IPMIView
application tool for the system.
For purposes of denoting the amount of redundancy, a server system has N main power
supplies to support the whole system working, with a “+” number after the N denoting
the number of redundant power supplies. Hence, if there is one power supply for
redundancy in a system that has the feature of “redundant power”, the total of power
supplies for that server system is denoted as N+1.
For example, suppose a 10-blade system has four 2200 Watt Power Supply Units
(PSU), for a total power supply of 8800 Watts. The maximum power usage of each
blade is 375 Watts for a total power demand of 3750 Watts to run the whole system. So
in this example there are effectively two redundant power supplies (N+1) over what is
needed to power the blades in the system.
In the IPMIView tool you can set the priority (default CPU power usage) of each blade
first before any PSU fails (0%->shut down, 50%->throttling, 100%->Running). See
Figure 5-3 below for an example.
Figure 5-3. Power Supply Status