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Between the servers and switches are two identical Coyote Point Equalizer 350 load balancers run in primary/backup high availability mode. The top load balancer is connected to the top switch and the bottom load balancer to the bottom switch. Hence, they exchange heartbeats through the interconnected switches, so if one switch goes down, whichever load balancer is connected to the remaining switch will become primary, and since each server has an interface connected to both switches, it will continue to be able to communicate to both servers.
All Fourmilab computers
are backed up daily with
LTO-3 tapes which are kept forever,
with off-site full backups made monthly.