Server increasing load due increasing processes in D state

Alessandro Tagliapietra tagliapietra.alessandro at
Mon Feb 25 11:29:15 UTC 2013

Hello guys, 

at work we've the openstack controller that since some months started to increase its load after some days of uptime.

I've seen that the cause is that processes sometimes hangs and remain in D state.

I've used some combination of ps args to get these outputs:

The hdd is a soft-raid1 over 2 disks, which SMART values are fine.

Commands like lsof, strace on a D process doesn't return.

Any idea on what could be the cause?

Thanks in advance


Alessandro Tagliapietra ( 
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