Table of Contents

Citrix XenServer and Power Management

See also Power Management

See also other XenServer pages in this wiki

https://wiki.xenserver.org/index.php?title=Power_Management

http://www.ingmarverheij.com/damn-you-c-states-unexpected-xenserver-reboot/

http://support.citrix.com/article/CTX127395

:!: With newer XenServer versions, it is no longer recommended to disable power management in the server BIOS.

:!: Disable all power management in the BIOS:

Get Power Managemment Status

On the XCP/XenServer host as root:

xenpm get-cpufreq-states

No output indicates the (SpeedStep, PowerNow) power management has already been disabled.

xenpm get-cpuidle-states | grep total | uniq

If C2 or higher is listed and there is time spent in that higher level state, this indicates that higher level C-states are still active. Check BIOS settings to disable the higher C-states.

:!: A result above 2 indicates you need to disable power management in the BIOS.

BIOS Settings

:!: Disable all C-states, including C1E.

:!: If the server BIOS has power management options that leave power management to the BIOS rather than the operating system such as Dell Active Power Controller or HP Power Regulator, also disable this by setting the power management option to OS Control.

Dell:

HP:

Intel: