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IT Baseline Protection Manual - The Information Warfare Site

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Safeguard Catalogue - Communications Remarks<br />

____________________________________________________________________ .........................................<br />

must be configured in such a way that, when failure of a server occurs, it<br />

automatically switches over to a substitute computer within the system.<br />

- In the extreme case where failures are only tolerable for a number of<br />

seconds, installation of a completely redundant fail-safe system is<br />

necessary, with multiple CPUs working in parallel. In this case, failure of a<br />

CPU or main memory module will not be noticed by the user. This option<br />

offers the highest form of security against failure but also requires more<br />

effort and greater financial expenditure. <strong>The</strong>refore this option will only be<br />

selected for extreme availability requirements. At present Windows NT<br />

cannot satisfy such requirements. In this case, special systems should be<br />

installed that run under other operating systems.<br />

<strong>The</strong> concrete availability requirements must, in any case, be determined via<br />

careful analysis. Within the framework of detailed planning of system and<br />

network architecture, an appropriate combination of redundant computers<br />

and/or hard disks must be found which fulfil these requirements.<br />

Additional controls:<br />

- Are the current availability requirements of applications and their interdependencies<br />

known?<br />

____________________________________________________________________ .........................................<br />

<strong>IT</strong>-<strong>Baseline</strong> <strong>Protection</strong> <strong>Manual</strong>: Oktober 2000

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