Hello Goetz,
>
> I´ve already found out that two hostadapter drivers exist: one in the
> standardkernel (qlogicfc.o) and one from qlogic. Does anyone knows which
> one to prefer? Will the Qlogic-driver work with 2.2.18?
>
Both the standard driver and the Qlogic one should work with 2.2.18.
>
> Ok, here is my confusion: the hostadapter is redundant and therefore got
> two controllers (channels?), both connecting via fc to the RAID
> controller/array. When the array is, for example, configured as two
> logical drives, the kernelmodul reports 4 devices (/dev/sdc, /dev/sdd,
> /dev/sde, /dev/sdf), from which only two are usable. Is that "normal"
> behavior? What happens in the case of a controller-failure?
>
At the moment you have 2 choices:
1. configure the FastT500 controller to be non-redundant. You loose the
high-availability features.
2. Use a multipath failover driver. For my knowledge there is only one
available for Linux (and only for 2.2.x kernels), originally written
by Linucare for Sun T3 arrays and now GPL'ed. See
http://open-projects.linuxcare.com/t3/index.html
for details and source. It does work for other storage systems as well.
Does anyone know of other projects in this direction?
>
> Thanks for every tip and answer,
>
Please share your experience with us in return ...
Best regards ..
Alexander Warmuth
IBM Storage Solutions Group
Advanced Technical Support Storage Area Networks
Mainz, Germany
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