toggle

AAPL Stock: 130.28 ( + 0.61 )

Printed from http://www.macnn.com

Mac OS X 10.6.8 Server hwmond bug consumes CPU power

updated 04:50 pm EDT, Mon June 27, 2011

Bug appears to affect auto-restart on some Xserves

A bug discovered in the Mac OS X 10.6.8 Server update is causing the hardware monitoring daemon, hwmond, to consume up to 95 percent of CPU power on a variety of Xserves, according to an Apple forum thread. Member Arminhempel reports a CPU load up to 70 percent after every reboot on several Xserves he manages; Jean-Serge Remy has an Xserve Xeon showing an 84 percent hit, while InfraredAD is experiencing a 95 percent load on a 2008 quad-core Xserve, essentially wiping out an entire core. Both the combo and delta versions of the update have generated errors and, so far, the only reliable way to fix the issue is a downgrade to Mac OS X 10.6.7.

The update is also in some cases triggering a problem in which Xserves sit idle instead of automatically restarting. Some forum members who have tried restarts to rid themselves of hwmond issues have seen their servers first fail to shut down on command, then fail to restart. InfraredAD was forced to use the physical power button to shut his system down, after menu and command-line efforts failed. In four hours of leaving the server idle, the machine never automatically restarted.

The hwmond daemon can itself be shut down, but leaves a server without hardware monitoring, disabling the front LEDs that update the operational conditions of the machine. More importantly killing hwmond ends reporting, a very dangerous situation for administrators running RAID volumes or mission-critical servers.




by MacNN Staff

toggle

Comments

  1. Feathers

    Joined: Dec 1969

    +4

    Downgrade via Mac AppStore?

    With problems like this, how the h+ll will people downgrade to a previous versions if the OS is only available through the MacAppStore? Just a thought.

  1. testudo

    Joined: Dec 1969

    0

    downgrade?

    No downgrades, man. Just like iOS.

Login Here

Not a member of the MacNN forums? Register now for free.

toggle

Network Headlines

toggle

Most Popular

Advertisement

Recent Reviews

Brother HL-3140CW Color Laser Printer

It's inevitable, at some point somebody needs a hardcopy of a document. Paper never runs out of battery charge, after all. Our Mom, j ...

Linksys WRT1200AC Wi-Fi Router

Once upon a time, a brand-new Linksys router showed up on our doorstep. So we gathered some network-minded friends together, and hooke ...

Rapoo A300 Mini Bluetooth NFC Speaker

The Rapoo Bluetooth Mini NFC Speaker is a little metallic box about the size of a baseball. In spite of its small size, we were very p ...

toggle

Most Commented