I've been working with the storage guy in our business and I'm trying to get up to speed on zoning, but I'm finding conflicting information. I'm confused about the relationship between hard and soft zones, and WWN and port-based zones.
Here's what I thought was correct:
- Hard zoning is done by the switches, disallowing certain WWNs (or ports) from talking by examining source and destination information, regardless of knowledge of one another's existence. I compare this to conventional IP firewalls (only certain IPs can talk to one another - I know Google's IP but I still cannot reach it).
- Soft zoning allows everything to reach everything else, but prevents discovery of everything in the fabric by limiting what information the name server will respond with when a new HBA wants to know what it can talk to. I compare this to a DNS server that provides different responses based on the querying host - hosts can still talk if they know one another's IP address.
- WWN and port-based zoning are unrelated to the above - they simply imply how you identify members of a zone.
Here are the sites I've looked at:
(I know that none of these are particularly reputable - sue me :) )
Some of the sites above seem to say that hard zoning and port-based zoning are synonyms, as are soft zoning and WWN-based zoning.
tl;dr: Is there any fixed relationship between hard, soft, WWN, and port-based zoning in a SAN?
In case the answer is vendor-specific, we use HP SAN equipment, specifically HP HSV450 and HP XP12000 disk arrays, with (I think) Brocade switches.