I recently had to recover a lot of data from my backup pool which is on a Solaris 11 system. I''m now sending regular snapshots back to the pool and all was well until the pool became nearly full. I then started getting receive failures: receiving incremental stream of tank/vbox/windows at Wednesday_1800 into backup/vbox/windows at Wednesday_1800 zfs_receive: Can''t mount a version 6 file system on a version 33 pool. Pool must be upgraded to mount this file system. When I freed up space on the pool, the errors stopped: receiving incremental stream of tank/vbox/windows at Wednesday_1800 into backup/vbox/windows at Wednesday_1800 received 380MB stream in 18 seconds (21.1MB/sec) On the Solaris 11.1 sender: zfs get -H version tank/vbox/windows tank/vbox/windows version 5 - Odd! I assume an error code was being misreported. -- Ian.