Building an Extended Distance Cluster Using Serviceguard and Software RAID
Types of Data Link for Storage and NetworkingTypes of Data Link for Storage andNetworkingFibre Channel technology lets you increase the distance between the components in an 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 Fiber Optic alternatives.
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| Link Technologies and Distances |
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| Type of Link | Maximum Distance |
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| Gigabit Ethernet Twisted Pair | 50 meters |
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| Short Wave Fiber | 500 meters |
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| Long Wave Fiber | 10 kilometers |
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| Dense Wave Division Multiplexing | 100 kilometers |
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| (DWDM) |
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| The development of DWDM technology allows designers to use dark fiber | |
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| (high speed communication lines provided by common carriers) to extend | |
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| the distances that were formerly subject to limits imposed by Fibre | |
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| Channel for storage and Ethernet for network links. | |
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NOTE |
| Increased distance often means increased cost and reduced speed of | |
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| connection. Not all combinations of links are supported in all cluster | |
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| types. For a current list of supported configurations and supported | |
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| distances, see the HP Configuration Guide, available through your HP | |
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| representative. |
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52 | Chapter 2 |