[dm-devel] Re: [PATCH] Add ALUA hardware handler
Mike Christie
michaelc at cs.wisc.edu
Thu Oct 11 17:47:29 UTC 2007
Just some thoughts
Mike Christie wrote:
>> This is actually by design. Problem here is the port group as returned by
>> REPORT TARGET PORT GROUPS does not have any association to the controller
>> which handles these ports.
So I agree the hw handler just knows that it has paths unless you do
something like chandra and send commands to figure out the contoller
mappings. But are you saying that in userspace during dm mpath device
setup time, there is no way to figure out the mappings? We talked about
making the controller mappings and handling the problem where you cannot
flood the box and the problem of having to send multiple commands more
generic. We did not do that for rdac at the time because we thought scsi
hw handlers were going to be done sooner, and did not want to redo the
effort, but if it helps it could be done.
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