Hi,

I solved it using  the patch for hardware handler rdac from RHEL5.1 BETA and 
rebuild kernel from RHEL5.0 Stable with that patch. I also had to use 
device-multipath-tools from RHEL5.1 Beta and it's working fine. If one path to 
the controller fails, it keeps on the same controller as it has one active 
path.

When both active paths fail, it requests through the passive path the failover 
of the lun and both passive paths transform in active ones.

Thanks
Nuno Fernandes

On Wednesday 26 September 2007 11:07:15 Jan-Frode Myklebust wrote:
> On 2007-09-25, Nuno Fernandes <[EMAIL PROTECTED]> wrote:
> > I also have both FC switches completly separated.
> >
> >                                | -> Controller A
> >
> > HBA A -> SwitchA  |
> >
> >                                | -> Controller B
> >                               |
> >                               |  -> Controller A
> >
> > HBA B -> SwitchB |
> >
> >                               |  -> Controller B
>
> No, these switches are connected trough the DS-controllers,
> and not completely separated. Problems on f.ex. HBA-B could
> propagate to both controllers, or HBA-A.
>
> Can you try this setup and see if it solves your problem ?
>
> HBA A -> SwitchA  | | -> Controller A
>
> HBA B -> SwitchB  | | -> Controller B
>
> You'll still have fully redundant paths to any LUN.
>
>
>   -jf
>
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