Virtual server access logging

An iRule could do the trick;

when CLIENT_ACCEPTED {
 log local0. "Client with IP address [IP::client_addr] connected to VS XXXXX"
}

But note that this will generate a log entry for every connection and if your traffic is high, this may be risky. You may want to look into High Speed Logging as an alternative.

You say just 'on the particular virtual server'? Do you already get logs for the others?