performance: domU in disk image or netboot from dom0 ?

[Joel CARNAT <joel%carnat.net@localhost>]

Hi,

I was wondering what was better (regarding performance) between using
disk images for domU and just "netbooting" them from dom0 ?

My current configuration is:
- every dom running NetBSD
- system and pkgsrc in disk images (4Go)
- data accessed by domUs from dom0 via NFS.

My thinking configuration would be:
- every doms running NetBSD
- system, packages and data accessed by domUs from dom0 via NFS/netboot.

any pros/cons ?

Going further, as every domUs (or at least 99%) will be NetBSD's, what
about using a single NFS shared system/packages via NFS with a layer for
conf and temp files.
Something like:
domU1:
        dom0:/exports/domUs     /               nfs
        dom0:/exports/domU1     /mnt/specific   nfs
        /mnt/specific           /               union
domU2:
        dom0:/exports/domUs     /               nfs
        dom0:/exports/domU2     /mnt/specific   nfs
        /mnt/specific           /               union

binary updates are done (once) in dom0:/exports/domUs.
each vmachine has it's own conf in dom0:/exports/domU*.
sounds crazy ?

TIA,
        Jo

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