3. try instance creation with something similar to
gnt-instance add -t ext --disk=0:size=10G,provider=zfs \
- --disk=1:size=20G,provider=zfs \
- -n arh-hw --no-name-check --no-ip-check \
- -o debootstrap+default -B maxmem=512M zfs-ext-test
+ --net 0:mode=bridged,link=br1001 \
+ --net 1:mode=bridged,link=br0060 \
+ --net 2:mode=bridged,link=br0080 \
+ --no-name-check --no-ip-check \
+ -o debootstrap+default \
+ -B maxmem=1G -n arh-hw zfs
+4. install helper scripts for daily block snapshots
+
+ ln -sf /usr/share/ganeti/extstorage/zfs/bin/daily-block-snapshot /etc/cron.daily/
+
+5. install lvm wrapper scripts to report zfs volumes as lv
+
+ find /usr/share/ganeti/extstorage/zfs/sbin/ -type f | xargs -i ln -v -s -f {} /sbin/
+
+This scripts enable gnt-node commands to work:
+
+root@vmh02:/home/dpavlin# gnt-node list arh-hw
+Node DTotal DFree MTotal MNode MFree Pinst Sinst
+arh-hw.gnt.ffzg.hr 87.8G 87.2G 7.8G 252M 5.6G 1 0
+
+root@vmh02:/home/dpavlin# gnt-node list-storage arh-hw
+Node Type Name Size Used Free Allocatable
+arh-hw.gnt.ffzg.hr lvm-vg arh-hw 190.0G 62.7G 127.3G Y
+arh-hw.gnt.ffzg.hr lvm-vg ffzgvg 87.8G 610M 87.2G Y
+
+
+HELPER SCRIPTS
+
+Helper scripts in bin directory list volumes, show size or snapshots.
+
+
+arh-hw:/usr/share/ganeti/extstorage/zfs# ./bin/list
+NAME USED AVAIL REFER MOUNTPOINT
+tmp500g/block 612M 87.2G 30K /tmp500g/block
+tmp500g/block/af1a90e8-0566-4cbf-bc8c-99fc82b67ce3.ext.disk0 612M 87.2G 610M -
+
+
+arh-hw:/usr/share/ganeti/extstorage/zfs# ./bin/size
+NAME PROPERTY VALUE SOURCE
+tmp500g/block/af1a90e8-0566-4cbf-bc8c-99fc82b67ce3.ext.disk0 volsize 11G local
+
+
+arh-hw:/usr/share/ganeti/extstorage/zfs# ./bin/snapshots
+NAME USED AVAIL REFER MOUNTPOINT
+tmp500g/block@etckeeper 0 - 30K -
+tmp500g/block/af1a90e8-0566-4cbf-bc8c-99fc82b67ce3.ext.disk0@2014-06-24 2.64M - 610M -
+
+KNOWN BUGS
+
+- in current ganeti, gnt-backup export doesn't work because extstorage
+ snapshoot hook is not available
+- gnt-instance move works from somewhere to zfs, but not from zfs to somewhere