If not, you would have to use hammer version-upgrade. See [hammer(8)](http://leaf.dragonflybsd.org/cgi/web-man?command=hammer§ion=8) for details.
# Saving the data
+At this point you should have a place ready to store all the compressed files you are going to generate.
+Mine is this:
+
+ smash64# df -h /mnt/pfs
+ Filesystem Size Used Avail Capacity Mounted on
+ dualsmash:/home/data/pfs 364G 235G 111G 68% /mnt/pfs
+ smash64#
+
+So we can start saving all our data:
+
+ smash64# cd /mnt/pfs
smash64# hammer mirror-read / | gzip -3 -c > root.gz
histogram range 0000000000000000 - 000000129a02c4b0
Mirror-read: Mirror from 0000000000000000 to 000000129a02c4b0