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Planning a Secure Baseline Installation
The amount of random access memory (RAM) and the speed and number of proces sors should always be part of a hardware specification for a server. Furthermore, in addition to the components that you want in the server when you purchase it, you should also specify the server s maximum capacity for these components, to account for future upgrades. For example, if you intend to purchase a server with one gigabyte of RAM, make sure that the computer can support at least two gigabytes (or more), so that you can install additional memory later, if necessary. You might also purchase a server that supports multiple processors, even if you are only going to use one right now. This way, you can always scale up the server s per formance by installing additional processors. In the same way, you should plan for future as well as current server disk capacity. For example, select disk arrays with slots for additional disks, or computer cases with enough internal bays for expansion. In addition to the performance levels your organization and your applications require, you should also consider your requirements for fault tolerance and availability, because these elements might affect your hardware specifications. Disk arrays that use hot plugging and redundant array of independent disks (RAID), redundant power supplies, shared storage solutions, tape backup drives, and server clusters all can be sub stantial additions to your server configurations.
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