System Fault Tolerance

:(DELETE) This text describes "product name", is not an encyclopedic entry.

In [[computing]], '''System Fault Tolerance''' ('''SFT''') is a [[fault tolerant system]] built into [[NetWare]] [[operating system]]s. Three levels of fault tolerance exist:

* SFT I 'Hot Fix' maps out bad disk blocks on the file system level to help ensure data integrity (fault tolerance on the disk-block level) * SFT II provides a [[disk mirroring]] or duplexing system based on [[RAID]] 1; mirroring refers to two disk drives holding the same data, duplexing uses two data channels/controllers to connect the disks (fault tolerance on the disk level and optionally on the data-channel level). * SFT III is a server [[redundancy (engineering)|duplexing]] scheme where if a [[server (computing)|server]] fails, a constantly synchronized server seamlessly takes its place (fault tolerance on the system level).

== References ==

* [http://www.novell.com/documentation/nw42/index.html?cncptenu/data/hdqefjoy.html Novell NetWare 4.2 documentation]

[[Category:NetWare]] {{comp-sci-stub}}