Lessfs-1.1.0-beta4 is now available for download. This release improves write performance when writes are done with small block sizes. The graph below displays the write performance of XFS, the fastest filesystem that is available for Linux and all other de-duplicating filesystems that are available for Linux. Both Lessfs and ZFS-fuse are deduplicating and compressing the data. SDFS does deduplicate but does not compress the data.

Nice to read that ! All theses performances let us want to try it out.
By the way, what about the configuration file of this version ? those the recommendations available for 1.0.8 are style good for this version ?
I mean by example are the values recommended by the well known “lessfsconfig.sh” script right for this new version ?
The values recommended by the lessfsconfig.sh script are still valid.
Lessfs-1.1.x is not compatible with lessfs-1.0.x due to small changes in the data model.
Lessfs-1.1.x really like threads, so where you would have MAX_THREADS=2 in the old situation you would need 5* as many with lessfs-1.1.x