Asus ASMB4-SOL PLUS User Manual download pdf (Page 5)

systems management

DELL POWER SOLUTIONS | November 2007

Reprinted from

Dell Power Solutions,

must be reset, administrators can also terminate the current session from

another console using the following command:

ipmitool –I lanplus –H ipaddress -U username -P

password sol deactivate

Using IPMItool raw commands

The IPMI specification defines many more management capabilities than

the IPMItool command-line options can provide. Administrators can take

advantage of these capabilities by framing raw command requests and

sending them to BMCs.

IPMItool raw commands have the following format:

ipmitool –I interface options raw netfn cmd data

In this format, interface can be open, lan, or lanplus. If open

is used, options is not included; otherwise, options is -H ipaddress

-U username -P password. The netfn element is the network function,

which identifies the functional message class and clusters IPMI com-

mands into different sets.

The cmd element represents a unique one-byte

command value within a given network function. Finally, the data element

provides additional parameters for a request or response, if any.

Three examples can help demonstrate using raw commands: changing

the power cycle interval, creating custom LCD messages, and generating

platform event messages.

Changing the power cycle interval

The power cycle interval is the time a system is powered down during a

power cycle operation initiated by either a chassis control command or a

watchdog timer. IPMItool does not include an option for setting this inter-

val, but administrators can do so using raw commands.

Appendix G of the IPMI 2.0 specification provides the command to

change the power cycle interval in the “Chassis Device Commands” section

as “Set Power Cycle Interval,” denoting the network function as “Chassis”

and the command value as 0Bh. Table 5-1 in the specification shows that

“Chassis” resolves to 00h (or 0x00). Appendix G also refers to section

28.9, where Table 28-10 provides the format for the request data—a one-

byte value representing the power cycle interval in seconds.

For example, administrators can set the power cycle interval to

15 seconds by constructing the following raw command:

ipmitool –v -I open raw 0x0 0x0B 0x0F

In this command, 0x0 is the network function, 0x0B is the command

value, and 0x0F is the power cycle interval (the one-byte value represent-

ing 15 seconds). Because the command included the -v option for verbose

output, the output would be as follows:

RAW REQ (channel=0x0 netfn=0x0 lun=0x0 cmd=0xb

data_len=1)

RAW REQUEST (1 bytes)

RAW RSP (0 bytes)

As denoted in Table 28-10 of the IPMI 2.0 specification, the output

also includes one byte of response data—in this case, 0, indicating a

successful response. If the command had been framed incorrectly, then

the response data might be 0xc7 and return the following output:

Unable to send RAW command (channel=0x0

netfn=0x0 lun=0x0 cmd=0xb rsp=0xc7): Request

data length invalid

To verify that the settings have been successfully applied, administrators

could run the command ipmitool chassis power cycle and check that

the server takes 15 seconds to power on again following the reboot.

Creating custom LCD messages

Server LCDs display details such as server type and platform events.

Administrators can use them, for example, to help identify a particular

server by using the ipmitool-identify command, which blinks the

LCD. In addition, LCDs can display custom messages, which is typically

done through Dell OpenManage

™

Server Administrator commands.

However, administrators can also use raw commands to display these

messages.

The Python script shown in Figure 6 displays the server load average

on the LCD. Administrators could run this script from the command line

For more information, see section 5.1 of the IPMI 2.0 speciﬁcation.

Figure 6. Python script to display average server load on an LCD

import os

load = open('/proc/loadavg').readline().

split()[2]

loadAvg = [hex(ord(i)) for i in 'LoadAvg

'+str(load)]

cmd = 'ipmitool raw 0x6 0x58 193 0 0 %d

%s'%(len(loadAvg), ''.join(loadAvg))

os.system(cmd)

os.system('ipmitool raw 0x6 0x58 194 0')

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