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

so is this behavior by design? In this case, patching in the scsi subsystem won't help to much, will it?
Manually updating the multipath information - well, yes, that will work I guess, but in the end that should work without manual intervention. Thus, I'd need to have a job checking the multipath table if there are stale devices, and, if there are, rerun multipath to get them out. Not exactly smooth, is it?
----- Original Message -----
Sent: Thursday, October 18, 2007 8:19 AM
Subject: Re: [dm-devel] multibus / failover and EMC CX600

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 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.


Dr. Hannes Reinecke       zSeries & Storage
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