Guides for new HPC admins

In my company, it's fallen on me to serve as the admin of our new HPC cluster, a task that's very new to me. It's very important to me to lay a solid foundation and avoid any unnecessary pitfalls. So, can anyone recommend a succinct guide or list of do's-and-don'ts for adiminstering an HPC cluster? The cluster runs the latest CentOS, PGI compilers, MPICH2, WRF, etc.

Thanks!