Hung in D state during fclose

[Dave Chinner]

On Tue, Feb 12, 2013 at 09:06:03PM +0000, Cheung, Norman wrote:
> [NLC] Only 2 threads in D state.  I  need to wait for the next
> hang to take another stack trace.  Is there any workaround I can
> reduce the frequencies of this hang.  What about reducing the
> xfssyncd_centisecs? Or other knobs?

You need to isolate the cause of the hang before changing anything.
Twiddling random knobs won't improve the situation. Understand the
problem first, then take appropriate action.

> [NLC]  2 RAID controllers in the system, it hung from disks on
> both of them.  One is SuperMicro 2208 and the other is LSI
> 9265-8I.  I think both use the same chipset.

Does the filesystem that hangs always belong to the same controller?

Cheers,

Dave.
-- 
Dave Chinner
david at fromorbit.com