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[dm-devel] Re: [PATCH 7/7] scsi_dh: attach to hardware handler from dm-mpath



Chandra Seetharaman wrote:
Hi Hannes,

Now I see why you want this change in dm-multipath. I think I agree with
these changes.

Ah. good.

But, it brings another question: what does dh_state provide ? Help to
user to see which hardware handler a device is attached to ?

And allowing to attach to a different hardware handler.
Not everyone is running multipathing, but might be interested in the
having the device handler nevertheless.

I thought more about the scsi_dh_detach function (in the context of my
earlier comment), adding it would require more housekeeping to associate
one-to-one mapping between attach and detach. We can leave it the same
way as the module will be detached when the device disappear eventually.

Why? You can detach with dh_state, too; just do an

echo detach > /sys/block/sdX/device/dh_state

and the hardware handler will detach.
So no additional attribute is required.

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)


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