Re: [dm-devel] multibus / failover and EMC CX600

[Hannes Reinecke <hare suse de>]

On Wed, Oct 17, 2007 at 08:04:12PM +0200, Gerald Nowitzky wrote:
> I'm afraid the patch did not work for me. I'ts still the same.
> 
> I am using kernel 2.6.22.2 at the moment. Should I upgrade to 2.6.23 ?
> 
> Anybody any Ideas?
> The system is not in production at the moment. We could do some testing.
> 
Well, yes. By the looks of if the problem is with multipathing still holding
references to the stale devices.
IE after dev_loss_tmo kicks in, the devices are removed from sysfs.
But multipathing does _not_ update it's device-mapper tables (that's why
you see all the '#' in the output), so there's still a refence on the
removed device and the in-kernel resources can't be freed.

So when the device is re-registered, you're getting this Oops.

Try to update the multipath information by running 'multipath' after the
devices have been removed. Once the '#' in the output are gone, you can
savely re-add the devices.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare suse de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)