Although the recommended method to back up files on another server is to use a backup service under Windows NT Server, system administrators will commonly want offline backup capabilities to be available. This section defines the guaranteed power requirements for servers. System includes UPS provided with system Recommended For servers deployed in many corporate environments, the more common choice will be to provide guaranteed power for the server room. For each voltage used in the system, the output voltages of the redundant power supplies should be within the range of values that can guarantee the proper operation of the system, no matter which supply is active. This section provides design guidelines for fault-tolerance features and capabilities.
Bus mastering is required for the drive controllers.
Use of multiple hard drives and controllers in a server system provides both performance and reliability benefits, and it is strongly recommended for server systems. An intelligent RAID controller, where the controller itself has the capability to run the array management software locally rather than simply executing disk accesses for host-based array software, provides the benefit of reduced demands on the host processor or processors, thereby freeing those computing resources and allowing their use by other tasks. If an intelligent RAID controller is provided in a system, it should be capable of handling sufficient amounts of disk storage to fulfill the needs of the targeted usage model for that server. These needs will vary based on the storage-intensive nature of the server s tasks. RAID 5 is also acceptable.