Our host (vps.net) will upgrade the server machine for free.
starting this week, the node processor goes from 400 to 600 mhz each clusters and memory from 256 mb to 275 mb.
Now a days, we do not need 3 ghz process power, so, we decide to decrease the new server from 5 nodes to 3 nodes.
The economy goes around USS 34,00 / month.
So, it's possible that this server stay off-line in this upgrade process.