Tell a minimum requirement for RAM for virtual machines (virtualbox)

[Vladislav V. Prodan]

Tell choice OS (8.2, 8.2-CURRENT or 9.0-CURRENT, FS (UFS or ZFS) and the 
minimum amount of RAM for use in such schemes:
1) the interaction of multiple routers with established quagga (bgpv4, 
bgpv6, ospf)
2) the work of two different modes of MYSQL replication servers/clusters.
3) backup zfs partitions/snapshots to a remote server


Host machine - win7 64x with 6 GB of RAM

Thank you for your advice.

-- 
Vladislav V. Prodan
VVP24-UANIC
+380[67]4584408
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vlad11 at jabber.ru