ZFS is awesome.  I never would have imagined I could ever get excited about a filesystem, but I did.  If you&#x27;ve never used it, I encourage everyone to check it out.  It&#x27;s so completely &quot;flexible&quot; and you can do things that you never would&#x27;ve thought of.<p>A while back, my personal mail server ran on FreeBSD 9.x on bare metal.  I wanted to rebuild the physical host but run everything in jails on a &quot;clean&quot; 10.x install instead.  I created a new virtual machine on our ESXi cluster, booted it with an mfsbsd image, and prep&#x27;d the hard disks.  Back on the server, I shut down all the services, took snapshots, and shipped them off to the VM using ZFS send&#x2F;receive.  In short order, I had P2V&#x27;d my mail server and it worked wonderfully.  I left everything running in that VM for a few days while I rebuilt the physical server and got all of my jails set up and then moved it all back.<p>Allan Jude gave a cool talk at vBSDcon a few months ago entitled &quot;Interesting Things You Didn&#x27;t Know You Could Do With ZFS&quot; [0]. If you&#x27;ve never used ZFS or you&#x27;re wondering what it might have over your current filesystem of choice, you might check it out.<p>[0]: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=qXOZmDoy2Co" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=qXOZmDoy2Co</a>