---
title: "System Fault Tolerance"
chunk: 1/1
source: "https://en.wikipedia.org/wiki/System_Fault_Tolerance"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T11:39:37.894392+00:00"
instance: "kb-cron"
---

(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 systems. 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 duplexing scheme where if a server fails, a constantly synchronized server seamlessly takes its place (fault tolerance on the system level).


== References ==
Novell NetWare 4.2 documentation