By Jon Tate; International Business Machines Corporation. International Technical Support Organization.; et al
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Extra resources for IBM SAN survival guide
Copyright IBM Corp. 2003. All rights reserved. 1 2 IBM SAN Survival Guide 1 Chapter 1. Introduction Until recently, disaster planning for businesses focused on recovering centralized data centers following a catastrophe, either natural or man-made. While these measure remain important to disaster planning, the protection they provide is far from adequate for today's distributed computing environments. The goal for companies today is to achieve a state of business continuity, where critical systems and networks are always available.
This could be called “true data sharing”. In a homogeneous server environment, with appropriate application software controls, multiple servers may access a single copy of data stored on a consolidated storage subsystem. If attached servers are heterogeneous platforms (for example, with a mix of UNIX® and Windows® NT), sharing of data between such unlike operating system environments is complex. This is due to differences in file systems, data 12 IBM SAN Survival Guide formats, and encoding structures.
24 IBM SAN Survival Guide Figure 2-3 Dual SC fiber-optic plug connector GBICs are usually hot-pluggable, easy to configure and replace. On the optical side they use low-loss, SC type, push-pull, optical connectors. They are mainly used in hubs, switches, directors, and gateways. Shortwave (or multi-mode) GBICs are usually color coded beige with a black exposed surface; and longwave (or single-mode) GBICs are usually color coded blue with blue exposed surfaces. The transfer rates typically range from 1063 Mb/s,1250 Mb/s, 2125 Mb/s, or 2500 Mb/s.