Advice on filesystem for quota and multiple acces on iSCSI LUNs

Hi,

I need advice on following setup:

• 2x Proxmox server need to access one NAS
• NAS has 4 GbE NICs with only one connected at the moment
• NAS is setup to provide iSCSI LUNs
• Filesystem on LUNs is XFS
• NAS currently provides a couple of SAMBA shares

Planned (among others):
SAMBA VZ to provide shares of iSCSI LUNs

• global shares
• user home directories _with_ quota

Main concerns:

• tape backup of NAS affects share bandwidth thus allowing me only to drive backups at night
• XFS is capable of quota but SIMFS on VZ container seems to support only ext3 (as far as I read somewhere)

Idea:
Convert XFS on iSCSI LUNs to OCFS2

• OCFS2 supports quota
• OCFS2 is accessible from multiple servers
• OCFS2 quota support seems not to be supported in VZ (found somewhere here in forum)

I would be glad to hear how others do setups like mine. Also any thinks and thoughts about my idea would be appreciated.

Regards
Ralf