Mac OS X Server 10.6.8 Causing CPU Load Issues for Xserves

by

Since the release of Mac OS X 10.6.8 last week, a number of Xserve users have reported in Apple's discussion forums (via MacNN) issues with a hardware monitoring daemon known as hwmond generating significant CPU loads of up to 95%.

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 also appears to be causing occasional issues with shutdowns and restarts as users attempt to address the hwmond CPU load issue.


Apple has yet to offer a specific solution for the issue, merely walking users who have contacted Apple Support through some troubleshooting steps without a specific resolution in place. But given the volume of complaints appearing in discussion forums, Apple will likely have to release a patch to address the issue.

Top Rated Comments

(View all)
Avatar
122 months ago
How does Apple screw something like an Xserve up? I mean this is a BUSINESS class product, and if there is nothing wrong with it, don't fix it!
Score: 3 Votes (Like | Disagree)
Avatar
121 months ago

It really isn't worth rolling back over, there is a simple workaround: -

Kill until reboot: -

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.hwmond.plist

Kill permanently: -
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.hwmond.plist
sudo mv /System/Library/LaunchDaemons/com.apple.hwmond.plist ~/Desktop/

The only thing I have noticed since doing this is the cpu-load leds on the front of our xserves stay fixed where they were the moment hwmond was killed, not a biggie.

HTH


Is it also killing the load monitors elsewhere? We do remote monitoring as the racks are tucked out of sight in a locked room. I rolled the one test bed back to 10.6.7 this morning though, finally had time to do it. Also found one of the Xserve RAIDs had had a minor HD meltdown as well...

If it's just LEDs, then I can live with that.
Score: 1 Votes (Like | Disagree)
Avatar
121 months ago

Yeah, it won't die permanently. Rolling back to .7 is the only solution until it gets fixed.


It really isn't worth rolling back over, there is a simple workaround: -

Kill until reboot: -

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.hwmond.plist

Kill permanently: -
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.hwmond.plist
sudo mv /System/Library/LaunchDaemons/com.apple.hwmond.plist ~/Desktop/

The only thing I have noticed since doing this is the cpu-load leds on the front of our xserves stay fixed where they were the moment hwmond was killed, not a biggie.

HTH
Score: 1 Votes (Like | Disagree)
Avatar
121 months ago

How does Apple screw something like an Xserve up? I mean this is a BUSINESS class product, and if there is nothing wrong with it, don't fix it!


Probably the same way as how they screw all their other business class products (Final Cut Pro, Cinema Displays, glossy Macbook Pros).
Score: 1 Votes (Like | Disagree)
Avatar
122 months ago
Parallels update ParallelsDesktop-parallels-en_US-6.0.12092.670880 may help

My 2007 MacPro(1,1) 4-core runs Mac OS X 10.6.8 client, not server, and was having problems with the Parallels VM (prl_vm) task swamping two cores which was accompanied by the Parallels Desktop v6 app becoming unresponsive. (I did not notice these problems under Mac OS X 10.6.7) Coincidently Parallels Desktop for Mac update US-6.0.12092.670880 was released, which appears to have solved the problem in my case. Perhaps this is related to the XServe issue reported in this thread and an update to Parallels there will help.


Parallels is a well known, widely used app - if they broke it in a maintenance update Apple's QA must be piss poor, bare minimum.


I have a similar problem since I upgraded. Did some searching this morning and found out it is related to Parallels. Obviously this isn't what everyone is experiencing, but if you have Parallels, there is a workaround here
http://kb.parallels.com/en/111541

Score: 1 Votes (Like | Disagree)
Avatar
122 months ago
Correct, it is recently discontinued, but it is still supported.

It is a DISCONTINUED business class product. And one that Apple never used themselves in their own data centers - they always used Sun hardware and Sun Solaris. The fact that they never ate their own dog food tells you a lot about how committed Apple are to their own business class products.

Score: 1 Votes (Like | Disagree)

Top Stories

New Photos Offer Better Look at iPhone 12 Color Options

Tuesday October 20, 2020 2:34 am PDT by
As we wait for the iPhone 12 review embargo to lift later today, more pictures are circulating of the devices in real-world lighting conditions, providing a better look at the different colors available. Leaker DuanRui has shared images on Twitter of the iPhone 12 in white, black, blue, green, and (PRODUCT)RED. The black and white colors are similar to the iPhone 11 colors, but the other...

iPhone 12 Pro in Graphite and iPhone 12 in Blue Shown Off in Unboxing Videos

Monday October 19, 2020 8:20 am PDT by
While the iPhone 12 Pro does not launch until Friday, we now have an early unboxing video of the device courtesy of Twitter account DuanRui, providing a closer look at the shiny new flat-edge design and sleek Graphite color option. Ben Geskin re-uploaded the unboxing video to YouTube, which we've embedded below: Geskin has also uploaded an unboxing video of the iPhone 12 in Blue: ...

Apple Releases iPadOS and iOS 14.1 With Multiple Bug Fixes Ahead of iPhone 12 Launch

Tuesday October 20, 2020 10:06 am PDT by
Apple today released iOS and iPadOS 14.1, the first major updates to the iOS and iPadOS 14 operating system updates that were released in September. iOS and iPadOS 14.1 come a week after Apple released the golden master versions of the updates to developers. The iOS 14.1 update can be downloaded for free and it is available on all eligible devices over-the-air in the Settings app. To access...

Watch: iPhone 12 and iPhone 12 Pro Unboxing Videos and First Impressions

Tuesday October 20, 2020 6:05 am PDT by
Apple's embargo has lifted for iPhone 12 and iPhone 12 Pro reviews. In addition to our detailed review roundups for each device, we've rounded up over a dozen unboxing videos and first impressions below. iPhone 12 in Blue on left and iPhone 12 Pro in Pacific Blue on right via Engadget Key new features of the iPhone 12 and iPhone 12 Pro include a flat-edge design, 5G support, a much faster A14 ...

Gold Version of iPhone 12 Pro Apparently Has a More Fingerprint Resistant Stainless Steel Frame

Tuesday October 20, 2020 11:56 am PDT by
iPhone 12 Pro reviews hit the web today, and one of the more interesting tidbits came from TechCrunch's Matthew Panzarino, who revealed that the Gold version of the device apparently has a more fingerprint resistant coating applied to the stainless steel frame. From his review:Most of the iPhone 12 Pro finishes still use a physical vapor deposition process for edge coating. But the new gold...

Photographer Austin Mann Tests the iPhone 12 Pro's Camera

Wednesday October 21, 2020 4:14 am PDT by
Travel photographer Austin Mann usually performs an in-depth review of new iPhone models to test their camera performance in real-world scenarios. To test Apple's new iPhone 12 Pro, Mann traveled to Glacier National Park, Montana. Mann focused on some of the biggest camera upgrades with the iPhone 12 Pro, including the upgraded Wide lens, Ultra Wide Night mode, and LiDAR autofocus, across a...

iPhone 12 Pro Max Has Smaller 3,687 mAh Battery According to Regulatory Filing

Tuesday October 20, 2020 8:48 pm PDT by
Apple's new iPhone 12 Pro Max is equipped with a 3,687 mAh battery, which is around 7% less capacity than the 3,969 mAh battery in the iPhone 11 Pro Max, according to a regulatory filing published by TENAA, the Chinese equivalent of the FCC. The regulatory filing, spotted by MacRumors, also lists the iPhone 12 Pro Max with 6GB of RAM as seen in benchmark results last week. Apple has filed ...

5G Drains iPhone 12 Battery 20% Faster Than 4G in Benchmark

Wednesday October 21, 2020 3:17 am PDT by
After the first reviews for the iPhone 12 and iPhone 12 Pro emerged yesterday, a new report by Tom's Guide reveals the extent of battery life reductions when using 5G. The report outlines a test wherein the iPhone surfs the web continuously at 150 nits of screen brightness, launching a new site every 30 seconds until the battery drains. Interestingly, the test was run on an iPhone 12 and...

Hands-On With Apple's iPhone 12 and 12 Pro MagSafe Cases

Tuesday October 20, 2020 1:33 pm PDT by
Apple's iPhone 12 and 12 Pro are launching this Friday, and ahead of that release date, Apple is shipping out various accessories like the MagSafe charger and MagSafe cases. Yesterday we took a look at the MagSafe charger, and today our MagSafe case came in the mail, so we thought we'd take another look at the charger to see how it works with the case and just how strong the case magnets are. S ...

Reliable Leaker Suggests AirTags 'Coming Soon' in Two Different Sizes

Tuesday October 20, 2020 1:53 am PDT by
Apple's rumored AirTags Bluetooth tracking devices could launch imminently and will be available in two size options, based on new tweets from cryptic-but-reliable leaker L0vetodream. In typical enigmatic style, the leaker first tweeted this morning that a "big one" and a "small one" are "coming soon," but withheld what they were referring to. However that was followed an hour later with the ...