Re: md data-check causes soft lockup

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On Tue Sep 22, 2009 at 07:59:45AM -0700, Lee Howard wrote:

> Majed B. wrote:
> > I must have missed that part. It may not work for your case, but worth trying.
> >
> > Perhaps Neil Brown, or someone involved could shed some light on this.
> >
> > If I remember correctly, those soft lockups were harmless anyway.
> >   
> 
> Not harmless for production use.  Yes, data is not harmed, and yes, the 
> problem state does recover when the data-check finishes, but during the 
> data-check the system is virtually unresponsive and all other use of the 
> system is stalled.
> 
Are you sure this is caused by these soft lockups, and that you're not
just running with too high a /sys/block/mdX/md/sync_speed_max setting?
I've had issues with this on some servers, where the I/O demand for the
sync/check is causing the system to become totally unresponsive.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@xxxxxxxxxxxxxxx> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

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