The commonly-used file systems are ext4, xfs and zfs. A good choice is xfs, which is considered stable and has good performance.
xfs is also going to become the default file system for the next RHEL distributions.
Also, when mounting your disks, ensure that the option 'noatime' is always used. This makes the file system not update information of files that have been updated, information that we do not care about for a database server. Also ensure that the active transaction logs(pg_xlog) is used on a fast file system