Designing Disaster Tolerant High Availability Clusters, 10th Edition, March 2003 (B7660-90013)

Building an Extended Distance Cluster Using MC/ServiceGuard
Types of Data Link for Storage and Networking
Chapter 250
Types of Data Link for Storage and
Networking
FibreChannel technology lets you increase the distance between the
components in an MC/ServiceGuard cluster, thus making it possible to
design a disaster tolerant architecture. The following table shows some
of the distances possible with a few of the available technologies,
including some of the FibreChannel alternatives.
The development of DWDM technology allows designers to use dark fiber
(high speed communication lines provided by common carriers) to extend
the distances that were formerly subject to limits imposed by
FibreChannel for storage and Ethernet for network links.
NOTE FDDI Networking is a ring topology therefore, the maximum effective
distance supported between data centers is 50 kilometers
Table 2-1 Link Technologies and Distances
Type of Link
Maximum Distance
Supported
Fast/Wide SCSI 25 meters
Gigabit Ethernet Twisted Pair 50 meters
Short Wave FibreChannel 500 meters
FDDI Networking 100 kilometers
Long Wave FibreChannel 10 kilometers
Finisar Gigabit Interface Converters
(GBICs)
80 kilometers
Dense Wave Division Multiplexing
(DWDM)
100 kilometers