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Clustering Technology For Fault Tolerance. Jim Gray Microsoft Research http://www.research.Microsoft.com/~Gray. What is Wolfpack?. A consortium of 60 HW & SW vendors (everybody who is anybody) A set of APIs for clustering and fault tolerance An enhancement to NT™ Server (in beta test )

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Clustering technology for fault tolerance l.jpg

Clustering TechnologyFor Fault Tolerance

Jim Gray

Microsoft Research

http://www.research.Microsoft.com/~Gray


What is wolfpack l.jpg
What is Wolfpack?

  • A consortium of 60 HW & SW vendors(everybody who is anybody)

  • A set of APIs for clustering and fault tolerance

  • An enhancement to NT™ Server (in beta test )

  • Key concepts

    • System: a particular node

    • Cluster: a collection of systems working together

    • resource: a hardware or software module

    • resource dependency: one resource needs another

    • resource group: fails over as a unit: dependencies do not cross group boundaries


What wolfpack supports in v1 l.jpg
What Wolfpack Supports in V1

  • two node failover (twin-tail SCSI)

  • Apps:

    • File, Print, web server, IP address, Net Name

    • Most of Microsoft BackOffice (SQL, Exchange, Viper, Falcon,…)

    • Oracle

    • SAP

    • many others

  • Easy to program, operate, use


Cluster advantages l.jpg
Cluster Advantages

  • Clients and Servers made from the same stuff.

    • Inexpensive: Built with commodity components

  • Fault tolerance:

    • Spare modules mask failures

  • Modular growth

    • grow by adding small modules

  • Parallel data search

    • use multiple processors and disks


What happens when a component fails l.jpg
What Happens When a Component Fails?

  • Redundant disk or path: configure around it.

  • Non-redundant software: restart.

  • Non-redundant hardware: migrate software to surviving nodes.

  • Fault detection: 1 ms to 10 sec.

  • Failover .1 sec to 1 min.

  • This is standard in Tandem, Teradata, VMScluster


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