[DCMI] Power Management Commands

Get Power Reading (O) - NetFn = DCGRP (0x2ch), CMD = 0x02h, Privilege Level = User
[IPMI tool in Linux]
ipmitool raw 0x2c 0x02 0xdc Data[2:4]
ipmitool dcmi power reading

For example
[IPMI tool in Linux]

$ipmitool raw 0x2c 0x02 0xdc 0x01 0x01 0x00
 dc 28 00 1e 00 47 00 1e 00 1b 58 8c 51 88 13 00
 00 01
$ ipmitool dcmi power reading

    Instantaneous power reading:                    42 Watts
    Minimum during sampling period:                  2 Watts
    Maximum during sampling period:                 81 Watts
    Average power reading over sample period:       31 Watts
    IPMI timestamp:                           Wed May 15 00:03:26 2013
    Sampling period:                          00005000 Milliseconds
    Power reading state is:                   deactivated

Get Power Limit (O) - NetFn = DCGRP (0x2ch), CMD = 0x03h, Privilege Level = User
[IPMI tool in Linux]
ipmitool raw 0x2c 0x03 0xdc 0x00 0x00
ipmitool dcmi power get_limit

For example
[IPMI tool in Linux]

$ ipmitool raw 0x2c 0x03 0xdc 0x00 0x00
 dc 00 00 01 f4 01 e8 03 00 00 00 00 05 00
$ ipmitool dcmi power get_limit

    Current Limit State: Power Limit Active
    Exception actions:   Hard Power Off & Log Event to SEL
    Power Limit:         500 Watts
    Correction time:     1000 milliseconds
    Sampling period:     5 seconds

Set Power Limit (O) - NetFn = DCGRP (0x2ch), CMD = 0x04h, Privilege Level = Operator
[IPMI tool in Linux]
ipmitool raw 0x2c 0x04 0xdc 0x01 0x00 0x00 Data[5:15]
ipmitool dcmi power set_limit <parameter> <value>

For example
[IPMI tool in Linux]

$ ipmitool raw 0x2c 0x04 0xdc 0x00 0x00 0x01 0x11 0x02 0x02 0x01 0x01 0x01 0x20 0x01 0x01 0x10 0x10

Activate Power Limit (O) - NetFn = DCGRP (0x2ch), CMD = 0x05h, Privilege Level = Operator
[IPMI tool in Linux]
ipmitool raw 0x2c 0x05 0xdc Data[2:4]
ipmitool dcmi power deactivate
ipmitool dcmi power activate

For example
[IPMI tool in Linux]

$ ipmitool raw 0x2c 0x05 0xdc 0x01 0x00 0x00
 dc
$ ipmitool dcmi power deactivate

    Power limit successfully deactivated

$ ipmitool dcmi power activate

    Power limit successfully activated

Scenario to set power limit:
1. Get Power Reading
2. Get Power Limit
3. Deactivate Power Limit
4. Set Power Limit
5. Activate Power Limit

Reference
[1] "Intelligent Platform Management Interface Specification Second Generation v2.0"
[2] "Data Center Manageability Interface: Spec, V1.5"
[3] "IPMItool" http://ipmitool.sourceforge.net/
[4] "IPMI Command Test Tool" http://www.intel.com/design/servers/ipmi/ipmi_tool.htm
[5] "IPMIUTIL USER GUIDE" http://ipmiutil.sourceforge.net/