System Area Network Interface Cards
By Stephen Bucaro
In organizations with large critical mission networks, servers are arranged in
clusters. In a cluster servers are configured to share resources such as
storage and processing as if they were a single more powerful server. If a
server in a cluster fails, the other servers in the cluster take over for it
and continue processing (called "fail-over").
Servers in a cluster can be configured to communicate with each other the
standard network, but in order to achieve the high level of performance
required, they usually communicate with each other directly over a separate
higher speed and higher reliability System Area Network.
Whereas the standard network may use twisted-pair cabling, the System Area
Network may use separate fiber-optic cabling. System Area Network
interface cards are special high speed circuits that provide communications
between the servers over the System Area Network.
If there are only two servers in a cluster, their System Area Network Interface
Cards can be connected directly to each other by a cable. If there are more
than two servers, a special hub is used to provide the connection.
More Networking Topologies Articles:
• Proxy Servers
• What Are Fiber Optic Attenuators?
• Wireless Networking Infrastructure Mode
• Introduction to SONET (Synchronous Optical Networking)
• VLAN (Virtual Local Area Network) Basics
• The Complete Guide to Fiber Optic Connectors
• Static Versus Dynamic Routing
• What is Fiber Optic Splicing?
• Cisco Switching Fundamentals
• Network Broadcast Storms
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