[dm-devel] Too many paths from multipath?

[Jose Nuno Neto]

Ok that seems right, but on my case I have 4connections per HBA total of 
8per Lun

The info I got regarding zoning is that each HBA is connected/zoned to 
only one Storage controller
So that would make 2connections per Lun

What I suspect is that the Fabric here is made of 4switchs and that 
makes 4x plus. The SAN people just configured it with a generic "big" 
fabric zoning just one connection. but Linux shoes 4. could this be the 
reason?

Jakov Sosic wrote:
> On Wed, 2009-12-02 at 16:45 +0100, Jose Nuno Neto wrote:
>
>   
>> I have 2 HBAs connected to one LUN on a Hitachi Storage. Only two 
>> connections have been zoned
>>     
>
> If one connection goes to one switch, and that switch is connected to
> two controllers on the storage, then you'll see two paths on that HBA in
> your host. If you have two HBA's and second is connected to second
> switch, which is also connected to two controllers of the stroage, then
> you'll see 4 of them.
>
> That is the situation in my company. It goes like this:
>
>
>              ________Hitachi controller0
>             /
> HOST----switch0
>             \
>              \_______Hitachi controller1
>
>
>
>
>
>   

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