ZFS, although fascinating and possibly superior, is NOT practical

Here's 4 Reasons the ZFS filesystem will never catch on (thanks wikipedia). The first one alone is enough to dissuade any Administrator from using the filesystem. From an Admin's persepective it's completely unnecesary to implement ZFS. The "OpenSolaris" project is just a ploy to create more Sun customers, it's NOT free, updates must be paid for.

-A




ZFS is currently not available as a root filesystem since there is no ZFS boot support. The ZFS Boot project is currently working on adding root filesystem support.[6]

ZFS lacks transparent encryption, a la NTFS, although there is an OpenSolaris project underway.[7]

ZFS doesn't support per-user or per-group quotas. Instead, it is possible to create user-owned filesystems, each with its own size limit. The low overhead of ZFS filesystems makes this practical even with many users.

RAID-Z doesn't support capacity expansion. It is possible to expand the array by iteratively swapping each drive in the array with a bigger drive and waiting for ZFS to heal itself - however this method is prohibitively expensive.