[c-nsp] VTP doubt

[james list]

Hi
I've two 6500 (6500-A and 6500-B) in production as VTP server, access
switch are 3750 or 4500 as VTP clients.

Today if I add manually a vlan on one of the two VTP server (ie on 6500-A)
it's propagated to the other server (6500-B) and clients.

The question is: do I've to add manually on both VTP servers or just one is
enough to keep redundancy ?

If VTP server (6500-A) is broken down for any reason, does 6500-B still
know the vlan added before only on 6500-B and continue to propagate to
clients ?

Cheers
James