For the unintiated, ZFS is the brand new file system that’s going to be in Solaris 10. ZFS is incredibly fast, reliable, and easy to manage. I recently moved my home directory from out UFS file server to an experimental ZFS file server. Opening my (extensive) mail spool went from 20 seconds to 3; doing an ls(1) sped up by more than a factor of two in my home directory; and the repository of crash dumps I keep went from 40G to 4G. This is really cool technology both under the hood and from the point of view of users and administrators — stay tuned to their weblogs for all the details.