Added the infra SOPs ported to asciidoc.

modules/sysadmin_guide/pages/virtio.adoc

@@ -0,0 +1,19 @@
+= virtio notes
+
+We have found that virtio is faster/more stable than emulating other
+cards on our VMs.
+
+To switch a VM to virtio:
+
+* Remove from DNS if it's a proxy
+* Log into the vm and shut it down
+* Log into the virthost that the VM is on, and [.title-ref]#sudo virsh
+edit <VM FQDN>#
+* Add this line to the appropriate bridge interface(s):
++
+....
+<model type='virtio'/>
+....
+* Save/quit the editor
+* [.title-ref]#sudo virsh start <VM FQDN>#
+* Re-add to DNS if it's a proxy