Hi Miguel, I believe you can find the answer if you put your configuration into SSIC:

https://www.ibm.com/systems/support/storage/ssic/interoperability

Hi Miguel, 

SSIC as mentioned by Hans is a great tool to determine if your configuration is supported. I find this link specifically for IBM i more helpful: 
https://www.ibm.com/support/pages/ibm-i-power-external-storage-support-matrix-summary
Here you'll read: "NPIV capable fibre channel adapters and SAN switches are also required."

So if you would like to use VIO with NPIV connected IBM i client LPARs, you need SAN-switches and the correct FC-adapters. 

However, there are two options:
If you would like to use VIO together with IBM i LPARs without SAN-switches, you could opt for vSCSI. It is still supported, although not very practical when doing storage migrations.

Although having SAN-switches is a requirement according to the documentation of IBM in order to use NPIV, I know NPIV does work without SAN-switch when using IBM Flash System. This is because there is a limited set of SAN-switch instructions supported by IBM Flash Systems itself. I would however highly recommend against this setup for production environments. You could use it in your lab environment. 

Kind regards,

David

Try:

# chfcportfeature -feature ns_discovery_auto_mode -enable yes

As David said, you can direct attach VIOS to FS5600 and it may very well work, however, that is an unsupported configuration and you may encounter issues with multipath failover and NPIV client adapters failing to log ion.  See: https://www.ibm.com/support/pages/direct-attached-storage-vios-npiv-clients

Bottom line, you really should use SAN switches with VIOS for NPIV, or hop in a time machine back to 2004 and use vSCSI (yuck).