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The latest stable version of zfs-fuse, 0.6.9, includes pool version 23 which has dedup support. Haven't tried it out yet, though.

http://zfs-fuse.net/releases/0.6.9

I will admit that I have not tried it on Linux, but zfs is the best of the next gen filesystems. It does cryptographically assured reads and writes (remember that transitory undetected disk malfunctions occur at a rate of ~1/TB of data), it can snapshot changes, it fricken slices bread. If it had a gender, I would probably marry it (well, I guess I can date it for a while and see how things work out). http://zfs-fuse.net/

You can run ZFS on Linux via FUSE. This would probably achieve exactly what the OP is looking for. See http://zfs-fuse.net/

ZFS works great through Fuse, and there is a stable release. http://zfs-fuse.net/ You really want to use some type of redundancy, whether mirroring or RAIDZ (or you can specify to automatically keep multiple copies on a single disk file system). ZFS uses this redundancy to repair data if it gets corrupted. I have found that RAIDZ is ridiculously processor intensive when added to the checksumming already being done with the data. Mirroring is tremendously faster, provides the flexibility to be reconfigured without making yet another copy, and if you do a 3-way mirror, more safe than anything else you can get (leaving off-site or multiple geographic locations out of the picture). Instead of a RAID set, ZFS allows you to create storage pools (like RAID 0) - the best way is to have each drive then mirrored. However, you can actually create pools out of RAID sets if (in my opinion) you're crazy enough to do so.

ZFS can also run inside a FUSE module on linux. I use it for managing my NAS and backup pools.

The performance isn't great, although it's perfectly adequate for my needs -- having the awesome volume-management capabilities are more than a worthwhile tradeoff. Sun's continually making improvements to ZFS, while the ZFS-fuse team have been working on the performance angle.

Word has it that a private company is also working on a cleanroom implementation of ZFS for the Linux kernel, which should be free of licensing issues. (Of course, one could question the necessity of this effort, as Btrfs should have most of the features that make ZFS desirable by the time it's done)

Try ZFS, which isn't available on Linux due to licensing

ZFS is available for Linux.

ZFS works quite well in Linux. I've been using it for over a year with no problems.

Do check out ZFS-Fuse . Development has accelerated over the past couple of months and it is very usable with decent performance.

Atleast one commercial offering is using ZFS-FUSE in its products - however, no idea whether it is using a custom non-community build.

I am using ZFS-Fuse on Ubuntu Hardy with 2 hard disks in a mirrored configuration, serving its files over Samba. We do incremental backups everyday (which the filesystem supports) and are quite happy with it.