The Intelligent Platform Management Interface (IPMI) is a set of computer interface specifications for an autonomous computer subsystem that provides management and monitoring capabilities independently of the host system's CPU, firmware (BIOS or UEFI) and operating system. IPMI defines a set of interfaces used by system administrators for out-of-band management of computer systems and monitoring of their operation. For example, IPMI provides a way to manage a computer that may be powered off or otherwise unresponsive by using a network connection to the hardware rather than to an operating system or login shell.
Oracle Servers have IPMI on board and it is good practice to ensure you make use of the HOST_LAST_POWER_STATE information to ensure your server boots directly when power comes back online or is not booting up when the server was already down during the power outage.
To verify the ILOM power up configuration, as the root userid enter the following command on each database and storage server:
if [ -x /usr/bin/ipmitool ] then #Linux ipmitool sunoem cli force "show /SP/policy" | grep -i power else #Solaris /opt/ipmitool/bin/ipmitool sunoem cli force "show /SP/policy" | grep -i power fi;
When running this on an Exadata the output varies by Exadata software version and should be similar to:
Exadata software version 184.108.40.206.1 or higher:
Exadata software version 220.127.116.11.0 or lower:
If the output is not as expected you will have to ensure make the settings correct so your Exadata machine boots directly after the power is restored.