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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

Clustering TechnologyFor Fault Tolerance

Jim Gray

Microsoft Research

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

what is wolfpack
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
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
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
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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