| German: | Schweiz |
| French: | Suisse |
| Italian: | Svizzera |
| Romansch: | Svizra |
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grail.cba.csuohio.edu - - [03/Dec/1994:00:26:26 +0100] "GET / HTTP/1.0" 200 0
on a fully-redundant “server farm”
mounted in a rack in the Fourmilab Hall of the Servers.
The two boxes at the bottom are the
Dell PowerEdge 1850 servers which host the
site. Each has dual Intel Xeon 3.6 GHz hyper-threaded processors,
which gives each server the equivalent of four CPUs. Each has 8 Gb
of ECC RAM, dual 146 Gb 10,000 RPM SCSI drives on an embedded RAID
controller, and two Gigabit Ethernet interfaces, which are “bonded”
into a single logical interface, with each physical interface
connected to one of the two 16 port
Dell PowerConnect 2616 Gigabit Ethernet
switches at the top of the rack.
The interface to switch connections of the two servers are crossed
with respect to one another. The two switches are connected together
and normally forward packets to one another; each is connected to the
DMZ port of one of the two redundant firewalls (which aren't in this
rack, but in the communications rack upstairs). The network
architecture is described in this
sporadically updated drawing.
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
Bacula onto
LTO-3 tapes which are kept forever,
with off-site full backups made monthly.