http://lukasz.cepowski.com/projects/freenas-storage-server-v1
https://pthree.org/2013/04/19/zfs-administration-appendix-a-visualizing-the-zfs-intent-log/
https://groups.google.com/a/zfsonlinux.org/forum/#!topic/zfs-discuss/hoG5-wrvQaQ
http://nex7.blogspot.com/2013/04/zfs-intent-log.html
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide
https://wiki.freebsd.org/ZFSTuningGuide
http://everythingshouldbevirtual.com/nexenta-performance-testing-no-ssdssd
http://blogs.citrix.com/2012/05/03/creating-vms-from-templates-in-xenserver-creates-a-fast-clone/
Show current ZFS parameters:
echo "::zfs_params" | mdb -k