disk expand

I have one standalone esxi 5.1 and vm's working on it. server owner says there is no disk space on linux server .

I checked the linux server, but I couldn't figure out which 6 discs are connected on vm.  which one is full. How can I find out which disk should I expand.

rvtools report about linux vm . also I added the virtual machine picture. how to find out which disk should I expand

thanks for helping