Linux Ubuntu, NFS for logs and cache, NFS or GFS

my company has no dev ops person and I am developer so I hardly know the best practices of dev ops as I am new to it, so please forgive me for any mistake. I have two Ubuntu machines. Each of them have a exact SAME web server and hence they give access logs. They both are running ruby on rails web server and using nginx. **Problem:** Now I need a common place for viewing access Logs and web application logs.. And file caching should ofcourse be common to both web servers. **For this I have to come this solution**: Have a separate server for storing cache and logs using NFS. So both the webservers will act as clients and store logs and cache in the NFS server. I have also heard slightly about GFS. Now cache is hardly going to get written once in hour or something but logs are written every second. So I want to know what should I use for this problem ? NFS or GFS or both ? Which will give me the best performance ? Some people say use GFS as I researched a lot in the internet, but I want to know why GFS can be better then NFS in my case?