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[dm-devel] Re: [BUG] dm-mpath and scsi persistent reservation



Christophe,

The SCSI Hardware handler is created for devices with special needs. It
is available in 2.6.27. One can be written for any device to translate
the scsi sense code to a different error code that the dm understands.
Is this something that coule help this situation ?

Have a look at drivers/scsi/device_handler directory.

Hope this helps,

chandra
On Tue, 2008-10-21 at 23:19 +0200, Christophe Varoqui wrote:
> Hi,
> 
> the dm-mpath multipathing driver enqueues write ios returned by
> the scsi layer with a "reservation conflict" error (on assymetric
> storage controllers, like Clariion, where queue_if_no_path is enabled).
> 
> This is wrong, and a potent data-corrupter : wio sent to a reserved
> scsi device should never be retried on this same device.
> 
> Can someone advise on a viable solution for this problem ? I
> understand the Device Mapper being a block remapper, it is not expected
> to receive scsi errors directly ... but maybe some kind of translation
> might be acceptable. Or is there hope in the request-based remapper ?
> 
> Jens, James, Alasdair, ... as maintainers of the involved subsystems,
> would you care to give some advise on the issue.
> 
> Regards,
> cvaroqui
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