statefull failover is only possible if you configure ASR.
This function exists only the CSS11500 and requires vip/interface redundancy. It is not supported with box-to-box redundancy.
If you remove/suspend the group, the CSS will stop nating the client ip address.
one armed 1 physical interface with 1 vlan.
This is just a "name" to qualify a particular design. The CSS does not know about one armed or inline.
So, if you have a single physicall interface betwen your CSS and a switch, it is possible to make this link a trunk and have multiple vlans. You would then be outside the one-armed mode.
Gilles.
Gilles.