The only proper response to OP's question is to ask for clarification: is the subdomain pointing to a separate IP? Are the logs vhost-specific or not?
If you don't get the answers, all you can do is to assume, and both assumptions may end up being right or wrong (with varying probability, perhaps).
The only proper response to OP's question is to ask for clarification: is the subdomain pointing to a separate IP? Are the logs vhost-specific or not?
If you don't get the answers, all you can do is to assume, and both assumptions may end up being right or wrong (with varying probability, perhaps).