Grp'd , N/Grp'd relate to DGs.

N/Asst'd relates to BCVs because you need to "associate" a BCV target to a device group when working with them.

for example :

# symdg create testdg

# symld -g testdg add dev AAA STD000

# symld -g testdg add dev BBB STD001

# symbcv -g testdg associate dev 110 BCV000

# symbcv -g testdg associate dev 111 BCV001

# symmir -g testdg -full -exact establish

So, BCV's should display Asst'd or N/Asst'd under the "Attribute" column in a symdev list

A ???:? relates to devices that aren't mapped to an FA port. For example, VAULT devices or TDATs (DATA Devices), under a #symdev list -all. Or, devices under a #symdev list -noport

Yes, an NA:NA is for TDEVs because they have no specific back-end allocation.[extents on a TDEV are allocated from all TDATs in the pool]

Hope this helps.