LUN and Storage Group mapping rule for EMC VNX SAN Storage
Product:
CLARiiON AX Series, CLARiiON CX Series,CLARiiON iSCSI Array, VNX, VNXe.
Description:
The rule is that multiple hosts can access one Storage Group, but one host cannot access multiple Storage Groups.
1- One Host can be member of one Storage Group at one time ,it can not be member of multiple storage group
2- One LUN can be member of Multiple Storage Group at same time .
3- You can not connect one storage group to multiple HOST which is already connected to another storage group. this will create LUN connection fluctuation and disconnection.
Resolution:
For high availability, a server can connect to only one Storage Group per storage system at a time. If you connect a server that already connects to a Storage Group to another Storage Group, the server will disconnect from the first Storage Group. When disconnect a server from a Storage Group, and then connect it to a different Storage Group, the server can no longer perform I/O to the first Storage Group.
link :- https://lighthouse.emc.com/docs/DOC-14611