Home > Articles > Operating Systems, Server > Solaris

  • Print
  • + Share This
Like this article? We recommend

Power Failure and Recovery Behavior

The recommended way to power down the system to standby is to use the shutdown command from the SC. The shutdown command will cleanly halt the Solaris OS if it is running before proceeding to power off the FRUs and entering standby mode.

The recommended way to power on the system from standby mode is to use the LOM poweron command without an option. This command powers on the FRUs and boots the Solaris OS. The poweron all command powers on only individual components. It does not run POST or boot the Solaris OS.

The 1280 server remembers the last state that the server reached when external power returns after a power interruption. If a power failure occurs when the server is in standby, it will cause the server to return to standby when power is reapplied. If a power failure occurs when the Solaris OS is active (including a Solaris OS boot or shutdown), the server will recover back to the Solaris OS when power is restored or remain at the OpenBoot PROM prompt, depending on the OpenBoot PROM auto-boot flag. If a power failure occurs when the Solaris OS is not active, the system returns to standby mode when power is restored.

If the server was on, it will return to the ON state when power is reapplied, and it will either remain at the OpenBoot PROM prompt or run the Solaris OS, depending on the OBP auto-boot flag. However, if the power goes out again before the server reaches the ON state, the server will not recover when power returns. While the chance of encountering this a situation is small, administrators in datacenters with unattended systems need to be aware of this issue so that human intervention is available in case the power goes out a second time during the system recovery.

If a power failure occurs when the server is in transition from standby to ON, or from ON (at the Solaris OS prompt or the OpenBoot PROM prompt) to standby, then the server will return to the last state it had reached when power is restored. If a power failure occurs when the Solaris OS is active (including a Solaris OS boot or shutdown), the system will recover back to the Solaris OS when power is restored.

The SC also provides the capability to abort the POST during a power on operation if a shutdown or poweroff request is made during this time.

  • + Share This
  • 🔖 Save To Your Account