Concurent SRDF

start out by getting your CE involved, in the mean time you can look at you current SRDF configuration by running:

symcfg list -sid 222 -RA all -v

you are probably interested in these entries:

Switched RDF Configuration State : Enabled
Concurrent RDF Configuration State : Disabled
Dynamic RDF Configuration State : Disabled
Concurrent Dynamic RDF Configuration : Disabled

ok, but i think I need to create an another RDF group in my master box .

CE isn't the only answer .. even SymCli can be used to build concurrent RDF configuration .. In fact we built a whole SRDF/STAR configuration from scratch using symcli.

There are a lot of prerequisites to be met... You have to verify that the binfile have the "Switched RDF" "Concurrent RDF" "Dynamic RDF" and "Concurrent Dynamic RDF" features enabled ..
You need to have RF (fibre adapters configured for SRDF) ready for switched RDF.

You need a new RDF group from the source to the target.

You need to enable "Dyn_RDF" on the volumes you want to replicate to the new box if the old relationship were static

After you have all those bricks you can build the wall and use the symrdf "createpair" command to really build the concurrent pairs.

It's a little bit too long to be explained in this thread .. but YES there are a lot of things that you need to look at

can customers like me create RA groups ?

I'm almost a "customer" like you .. I'm neither a CE nor an RTS .. I do use customer hosts to make things that the customer can do (but maybe is unaware he can do ;-)) ..
If the box is "dynamic RDF" ready you can make groups, you can create pairs, you can build even a STAR configuration .. as we did