Redundant Servers

Builtin capability of a system to provide continued correct execution in the presence of a limited number of hardware or software faults. The ability of a system to suffer a fault but continue to operate. Fault tolerance is achieved by adding redundant components such as additional disks within a redundant array of independent disks (RAID) or additional servers within a failover clustered configuration.
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A storage scenario in which database backups are transferred to a remote site in a bulk transfer fashion. The remote location may be a dedicated alternative recovery site (such as a hot site) or simply an offsite location managed within the company or by a contractor for the purpose of maintaining backup data.
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Maintaining a live database server at the backup site. It is the most advanced database backup solution.
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Instead of using one large disk to store data, one can use many smaller disks (because they are cheaper). See disk mirroring and duplexing. An approach to using many lowcost drives as a group to improve performance, yet also provides a degree of redundancy that makes the chance of data loss remote.
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Disk mirroring protects data against hardware failure. In its simplest form, a twodisk subsystem would be attached to a host controller. One disk serves as the mirror image of the other. When data is written to it, it is also written to the other disk. Both disks will contain exactly the same information. If one fails, the other can supply the user data without problem.
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