On 17.09.19 17:18, Johan Schelling wrote:
> I remember that when we started with KVM on LinuxONE around 3/4 years ago we 
> connected our V7000 directly (without a SAN switch) to the LinuxONE.  zVM 
> worked like a charm, but we had a lot of problems with (the then IBM 
> supplied) KVM…..  We had a lot of discussion with both the LinuxONE and the 
> storage guys as the documentation wasn’t quite clear on what was supported or 
> not. Problems we faced had to do with (hope I recall correctly) with WWPN’s 
> returned from the V7000 were  all mixed up…     At the moment we added a SAN 
> switch all our problems were gone … ;-)
> Haven’t had any problems with KVM since …..   but haven’t checked the 
> situation without a SAN switch in the last years.

Yes, there was a firmware issue with the V7000s back then. But this has been 
fixed.
I still have a v7000 directly connected to my test z13 as an outcome of that 
bug back then.
But as I said, unless this is officially supported by all components you should 
better 
use a switch. 

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