They're not really directly comparable. GlusterFS implements standard POSIX semantics and is directly mountable on a client. On the backend it can use another f

They're not really directly comparable. GlusterFS implements standard POSIX semantics and is directly mountable on a client. On the backend it can use another file system (ext, XFS, etc) where it actually stores the data. It's highly configurable in a variety of different server distribution schemes similar to RAID levels you'd use on local disk.