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Abstract - Technical Program - 2nd USENIX Windows NT Symposium
NT-SwiFT: Software Implemented Fault Tolerance on Windows NT
Yennun Huang, P. Emerald Chung, and Chandra Kintala
Bell Labs, Lucent Technologies
Chung-Yih Wang and De-Ron Liang
Institute of Information Science, Academia Sinica
Abstract
More and more high available applications
are implemented on Windows NT. However, the current version of Windows
NT (NT4) does not provide some facilities that are needed to implement
these fault tolerant applications. In this paper, we describe a set of
components collectively named NT-SwiFT (Software Implemented Fault Tolerance)
which facilitates building fault-tolerant and highly available applications
on Windows NT. NT-SwiFT provides components for automatic error detection
and recovery, checkpointing, event logging and replay, communication error
recovery, incremental data replications, IP packets re-routing, etc. SwiFT
components were originally designed on UNIX. The UNIX version was first
ported to NT to run on UWIN [Korn97]. Gradually a large portion of the
software has been re-implemented to take advantage of native NT system
services. This paper describes these components and compares the differences
in the UNIX and NT implementations. We also describe some applications
using these components and discuss how to leverage NT system services and
cope with some missing features.
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