NDLI: Disaster tolerant Wolfpack geo-clusters

Content Provider	IEEE Xplore Digital Library
Author	Wilkins, R.S. Xing Du Cochran, R.A. Popp, M.
Copyright Year	2002
Description	Author affiliation: Hewlett-Packard Co., Bellevue, WA, USA (Wilkins, R.S.; Xing Du; Cochran, R.A.; Popp, M.)
Abstract	Clustering of computer systems to increase application availability has become a common industry practice. While it does increase the availability of applications and their data to users, it does not solve the problem of a disaster (flood, tornado, earthquake, terrorism, civil unrest, etc.) making the entire cluster, and the applications and data it is serving, unavailable. Distance mirroring of an application's data store allows for recovery from disaster but may still result in long periods of unacceptable downtime. This paper describes a method for stretching a standard Wolfpack (Microsoft/sup /spl trade// Cluster Service, MSCS) cluster of Intel architecture servers geographically for disaster tolerance. Server nodes and their storage may be placed at two (or more) distant sites to prevent a single disaster from taking down the entire cluster. Standard cluster semantics and ease of use are maintained using the remote mirroring capabilities of Hewlett-Packard's high-end storage arrays. The design of additional software to control data mirroring behavior when moving or failing-over applications between server nodes is described. Also, software that allows "stretching" the cluster quorum disk between sites in a manner that is transparent to the cluster software and also software for an external arbitrator node that provides rapid recovery from total loss of inter-site communications is described. Flexibility provided by the array's firmware mirroring options (i.e. synchronous or asynchronous I/O mirroring) allows for optimum use of inter-site link bandwidth based on the data safety requirements of individual applications.
Sponsorship	IEEE Comput. Soc. Task Force on Cluster Comput. (TFCC)
Starting Page	222
Ending Page	227
File Size	319203
Page Count	6
File Format	PDF
ISBN	0769520669
DOI	10.1109/CLUSTR.2002.1137750
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-09-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Application software Computer industry Floods Tornadoes Earthquakes Terrorism Software design Microprogramming Bandwidth Safety
Content Type	Text
Resource Type	Article

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