When HBA port and the storage port are connected to the same switch. Some HBA ports require a different area ID than storage ports when they are both connected to the same switch. For example, if the storage port FC ID is 0x6f7704, the area for this port is 77. In this case, the HBA port's area can be anything other than 77. The HBA port's FC ID must be manually configured to
be different from the storage port's FC ID.
Can someone elaborate on which specific/host storage vendors referred here. Any insight on this behavior would be helpful.
Reference: MDS CLI Guide (Text Part Number: OL-16484-02) - Page 18-17
I found this and I'm wondering if the last part might be te answer you're looking for.
I'm assuming that everyone knows what an FCID is (Domain ID, Area ID, and Port ID). I'll expand on the Area ID for this question.
An Area ID is used to identify groups of ports within a domain and are also used to uniquely identify fabric-attached arbitrated loops. Each fabric-attached loop receives a unique Area ID.
It is this last part that I think is the answer you're looking for. So if you have point to point devices in say VSAN 100 and an arbitrated loop with devices in the same VSAN, you might see this scenario.