How to trigger SysRq from ipmitool and ipmiconsole using the SysRq magic keys over an HP iLO4 ?

Resolution

How do I configure a SysRq keys ?

• It is possible to invoke a Magic SysRq feature over a serial console by sending a 'break' serial command, followed by the desired key. The method of sending a break is dependent on the terminal program or hardware used to connect to the serial console.

  • Upgrade the iLO4 firmware version to 1.51

  • Setup an HP Virtual Serial Port in Red Hat Enterprise Linux. Refer: How does one set up a serial terminal and/or console in Red Hat Enterprise Linux?

  • Enable SysRq facility on the System. Refer: How to use the SysRq facility to collect information from a server which has hung

How to trigger SysRq event using ipmitool and ipmiconsole ?

• On serial console we can trigger the SysRq event by sending a Break signal to the console and then by hitting the desired keys. After sending the Break wait for 2 secs in order to send the desired SysRq event to the console.

From ipmitool:

• Run the below command to login to HP iLO4 management console,

 # ipmitool -I lanplus -H <IP of iLO> -U <user name of iLO4> sol activate

• Press ~B to send Break signal to the console which will further display as [send break] over the terminal.
• Press the desired Sysrq events.

Note: From ipmitool Break signal can be only send once.

From ipmiconsole:

• Run the below command to login to HP iLO4 management console,

# ipmiconsole -h <IP of iLO4> -u <user name of iLO4> -P

• Press &B to send Break signal to the console which will further display as [send break] over the terminal.
• Press the desired Sysrq events.

Note: It is possible to send Break signal more than once.