MFC request: QLogic 24xx FibreChannel controller

[mjacob at freebsd.org]

The GEOM multipath code hasn't been MFC'd yet.


On Fri, 9 Mar 2007, Ivan Voras wrote:

> Joao Barros wrote:
>> On 3/9/07, Ivan Voras <ivoras at fer.hr> wrote:
>>> I'm not familiar with this hardware, but I'm curious why I see the one
>>> test drive I assigned to it twice. I seem to recall reading somewhere a
>>> discussion for Linux in which it's been mentioned that one of these
>>> should be a read-write and another "read-only" device, but is this
>>> correct? I can write to both drives.
>>
>> I'd say because you have a multipath setup, the driver being the exception.
>> I guess the in house isp guru Matt Jacob can give you a better
>> explanation ;)
>
> I don't think it's because of multipath (as far as I understand it)
> because both disks are atached to isp0:
>
> da1 at isp0 bus 0 target 0 lun 0
> da2 at isp0 bus 0 target 1 lun 0
>
> There are two FC switches, but AFAIK a multipath setup would have, for
> example one disk coming from isp0 and the other from isp1, as isp0 and
> isp1 are connected to two switches...
>
> It's entirely possible that something's ill defined in the FC management
> console (I din't do it - it's another guy's responsibility :) )
>
>