Error logging vB 5.1.1 no go

[sparkybp]

Hi guys, this is going to sound weak, but I can't seem to get admincp to write error logs to anywhere.
I've set permissions to the directory to 777.
i've tried to create the directory below and above my public_html
im on a vps

I think what it boils down to, I'm not sure at which point in the directory structure does the admincp interface interpret me to be writing.

Like if I wanted to set the address in admin cp(in vB) for php error logging, would I have to do
http://sitename.com/logging/php_errors.log

or

/home/user/public_html/logging/php_errors.log

or

/logging/php_errors.log

or if I wanted to set my logs above the public_html directory could I do this?

/home/user/logging/php_errors.log

I don't understand what admincp can interpret? As far as it's concerned, does it only know about /whatever-folder-below-public_html ?

Thanks for your help!