HA Cluster with 2 Nodes, Backup

Hi,

First: Have a happy new year for everyone :-).

Second: I plan to setup a HA-Cluster using this guide: http://pve.proxmox.com/wiki/Two-Node...bility_Cluster

Will it work without the Quorum Disk (3rd node at all in general)? I want to use DRBD with LVM on it.

Also: In the past I had some problems with LVM-nodes when the secondary DRBD becames master in a fail-over-scenario. I had to create a small init-script to re-use LVM again. Will it work without no problems?

Third: In the past :-) I could not use whole size of the disk for one LVM because it needed some space left to create snapshot-partitions when performing backups (snapshot-mode). Is this still nessescarry? If yes, how big should it be? Is the size based of the max-amount of disk-space a VE has or are 20 / 30 G ok for the data which newly appear when performing backups?

And at last: I found out with Proxmox 1 / 2 it was not directly possible to use openVZ with DRBD/LVM. (see http://pve.proxmox.com/wiki/DRBD). Is it directly possible with Proxmox 3.1?

Thank you!