[dm-devel] good dm-mpath test setup?

[Hannes Reinecke]

On 06/05/2014 01:50 PM, Christoph Hellwig wrote:
> I've been looking into support blk-mq/scsi-mq in dm-mpath, but I'm
> already running into issues with mainline.  I created a couple luns
> (without second path) using iet, and then using the iscsi initiator
> to access them.  But it seems like no I/O is possible through dm-mpath
> for this simple setup as the kpartx processes spawned by udev already
> hang.  Is dm-mpath (default config, no multipath.conf) support to work
> for a single path setup, or is this expected behavior?
>
On a complete different footing, I've whipped together some patches 
to simplify the request/bio cloning when using multipath;
basically do _not_ clone the bios, but just modify the rq_end_io 
handler.

You mentioned something at LSF that the current way of handling is 
quite insane, and looking at it I tend to agree.

So if you'd be interested I'll be posting them.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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