Re: sw raid5 hungs on resync and high IO load, 2.6.32.23

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On Wed, 27 Oct 2010, Martin Hamrle wrote:

I am not sure what is the reason of the end of the weird state. I think the end was caused by starting copying kernel source into array.

It might be a 2.6.32 problem. I booted Ubuntu 10.04 LTS live off of an USB stick two days ago, proceeded to mount an external USB drive and started dd:ing my laptop drive to the external drive. To check the progress/speed I continued to do "apt-get install sysstat" (to get iostat). This install didn't succeed until the dd was over, I also about 40 gigs into the dd ran "sync" which blocked also until the dd was over.

So basically, dd:ing an internal 80 gig drive to external usb hd made two commands ("apt-get install" and sync) block and not succeed until the write pressure from dd was over. There might be something rotten here...

This was on a Thinkpad X200 laptop with 4 gigs of ram.

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Mikael Abrahamsson    email: swmike@xxxxxxxxx
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