that must be ACLX, you can write disable it and unmap it ..after that you will be able to start with Host LUN 0. If you look at that 2.81 MB device..it's just one device mapped to many FAs ..something that i have see CE do very often. That way when it's a brand new array you can zone to any port and start managing the array until you provision dedicated gatekeepers.
Just a question regarding Unisphere for VMAX and auto provisioning. I've noticed that it will automatically add LUN Address numbers from 1-x not 0-x, this results in a large number of 2.81mb disks on LUN 0 for each Port the host initiator connects to.  Is this by design? Or is there a way within Unisphere to set a volume on Address 0?
Unisphere for VMAX - Autoprovision LUN Addresses