Best Practice to Set OpenSolaris 200906 as xvm domain 0

See this blog:

 http://blogs.sun.com/levon/entry/opensolaris_2008_11_as_a1

But you should add a limit to dom0_mem on the kernel line in the
grub menu.lst entry... e.g.

 title xvm
 findroot (pool_rpool,0,a)
 bootfs rpool/ROOT/xvm
 kernel$ /boot/$ISADIR/xen.gz dom0_mem=2g
 module$ /platform/i86xpv/kernel/$ISADIR/unix /platform/i86xpv/kernel/$ISADIR/unix -B $ZFS-BOOTFS,console=text
 module$ /platform/i86pc/$ISADIR/boot_archive


Also, For the best experience, you probably should add the
following once you have booted into xVM

svccfg -s xvm/xend setprop config/dom0-min-mem=2000
svcadm refresh xvm/xend;svcadm restart xvm/xend

zfs create rpool/guests
zfs set recordsize=8k rpool/guests
zfs set mountpoint=/guests rpool/guests

# need to reboot after this one.
echo "set zfs:zfs_arc_max = 0x10000000" >> /etc/system