> http://www.andric.com/freebsd/zfs13/r192269/zfs_mfc-r192269.diff.bz2 Thanks - am going to gve this a try later. Preseumably if I leave the pool at the revision it is currently on then I can revert back easily ? Also, is this the version which no longer requires any tuning parameters in loader.conf ? That would be extermely interesting! -pete.