Sun Blade 6048 Modular System Service Manual

The amount of power used by the blades and other components cannot exceed the amount of power provided by the power supply units (PSUs). If demand exceeds supply, the PSUs might shut down completely and without warning. There are two things you can do to avoid this situation:

• When planning the system, calculate the power needs of your blades and other components, and verify that they do not exceed the power available. The power consumption data you need is provided in Section B.1, Determining Power Requirements.
• Use the power management system of the chassis ILOM to monitor power usage and to configure backup power supplies. See Section B.2, ILOM Power Management Features.

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B.1 Determining Power Requirements

The power requirement of a blade system is the sum the following:

• Power requirement of the chassis itself, including the CMM, but not including any blades, modules, or fans.
• Total power required for the blades, including power for internal options (processors and DIMMs) as well as power for external components attached to each blade.
• Total power required by Network Express Modules (NEMs).
• Total power required by fans.

The following sections contain the power consumption values assumed by the CMM ILOM. These are the values you should use for planning your system. The actual power consumption of real-world components may be significantly lower than the ILOM’s assumed values. However you must plan using the ILOM’s assumed values in order to avoid triggering the safety features of the ILOM’s power management system. See Section B.2, ILOM Power Management Features for more information.

B.1.1 Power Required by the Chassis

The chassis requires 20W. This figure includes power used by the CMM, but does not include power used by blades, modules, or fans.

B.1.2 Power Required by Blades

A blade’s power requirement is the sum of the following:

• The base power requirement for the blade. This value includes power required by the blade motherboard and service processor, but does not include power required by any optional components.
• The power requirements of any processors.
• The power requirements of any DIMMs.
• The power requirements of any disks.
• The power requirements of any attached PCI Express Modules (PCI EMs).
• The power requirements of any attached Raid Expansion Modules (REMs).
• The power requirements of any attached Expansion Modules (FEM).

For example, suppose you are estimating the power requirement for a maximally configured Sun Blade X6250, with the highest-powered processors. Its power consumption is given in TABLE B-1.

Power requirements for blade products and their components are given in the following tables. Note that PCI EMs always require 25W; this value is repeated in each table for ease of reference.

B.1.3 Power Estimates for Network Express Modules (NEMs)

A chassis can contain 1 or 2 NEMs, which must be the same model. Power requirements for each model are specified in TABLE B-8.

B.1.4 Power Requirements for Fans

A chassis has two kinds of fans:

• Fans in fan modules. Each module requires 65W.
• Fans in power supplies. Each power supply requires 72W.

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B.2 ILOM Power Management Features

The CMM ILOM power management system performs two functions:

• It reports values for power consumption and PSU power efficiency.
• It determines the power requirements of installed components, and only allows a blade to power up if doing so does not increase power requirements past power available. The power requirements assumed by the CMM ILOM are documented in Section B.1, Determining Power Requirements.

You can access power data and also configure the power management system through the CMM ILOM WebGUI, under the System Monitoring/Power Management tab, as shown in FIGURE B-1.

FIGURE B-1 Power Management Tab in CMM ILOM WebGUI

This information and configuration is also available through the ILOM command line:

-> show /CMM/powermgmt
 /CMM/powermgmt
    Targets:
        1 (Chassis DC Consumed Power)
        2 (Chassis AC Consumed Power)
        3 (PSU 0 AC Consumed Power)
        4 (PSU 0 DC Consumed Power)
        5 (PSU 0 Power Efficiency)
        6 (PSU 1 AC Consumed Power)
        7 (PSU 1 DC Consumed Power)
        8 (PSU 1 Power Efficiency)
    Properties:
        reserve_psus = 0
        total_psus = 2

For more information, refer to the documentation for your version of the ILOM.

The power management system automatically determines the amount of power available from installed PSUs. You can set aside one PSU as a reserve by setting the “Reserve Power Supplies” field in the WebGUI to “1.”. You can also set the reserve_psus property from the command line. Setting aside a reserve PSU reduces available power by 50%.

Caution - Before setting aside a reserve PSU, verify that currently powered-up blades will have their power requirements met by the single remaining PSU.

Sun Blade 6048 Modular System Service Manual

820-2863-13

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