[dm-devel] Re: multipath tool priority group question

[Mike Christie]

christophe.varoqui at free.fr wrote:
> You should use the group_by_tur policy.
> It does what you describe.
> 

Ok. I see it now. It was missing from the man and top of usage().
I was being lazy and didn't read on :)

I still am not sure this helps for the second case.
What if the secondary paths work, it's just that switching
to them is expensive? It looks like they will end up in one
group.


> Selon Mike Christie <michaelc at cs.wisc.edu>:
> 
> 
>>Hi Christophe,
>>
>>For policy it states, "failover 1 path per priority group",
>>but what if I want to put N paths in each group?
>>
>>I want to round-robin over N paths, and when they fail I want
>>to start using a lower priority group. I have two cases. One
>>where I have a set of paths that are imediately ready, and a
>>second set that has to be activated first. And a second case
>>where the second set is ready, but for any reason we want to use
>>it as backup only.
>>
>>Thanks,
>>
>>Mike
>>
>>
> 
> 
>