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FAILOVER CLUSTERING

Failover Clustering provides high availability to core Windows services. Microsoft failover clusters ensure that if one server stops functioning there are redundant server resources to ensure that your applications continue to function.

For example, if a cluster enabled database goes down, the database will be restarted on another cluster node so that continuous access is available.

Most server features and roles can be kept running with little to no downtime.

CLUSTERING DESIGN & STRATEGIES

  • DESIGN REQUIREMENTS

    We can help you make the best design decisions that will maximize application availability.

  • CLUSTER WITNESS

    The most common size for a failover cluster is the minimum two-node cluster. In high-load environments, a cluster may have many server nodes.

  • NODE RELIABILITY

    Failover clusters usually use all available techniques to make the individual systems and shared infrastructure as reliable as possible.

    Failover clustering reliability includes features like: disk mirroring, redundant network, redundant storage area network, and redundant electrical power.

  • FAILOVER STRATEGIES

    There isn’t a single high-availability cluster system to handle failures in distributed computing. There are different strategies:

    FAIL_FAST wherein the try fails if the first node cannot be reached, ON_FAIL_TRY_ONE_NEXT_AVAILABLE which tries one more host before giving up, and ON_FAIL_TRY_ALL_AVAILABLE: which tries all existing nodes before giving up.

FAILOVER CLUSTERING EXAMPLE

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