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Cluster Shared Volume (CSV) and Quorum RRS feed

Answers

  • Hi,

    Learning the Hyper V clustering, CSV are shared storage locations to store VM workloads ...correct?

    Yes, the Cluster Shared Volume (CSV) is a feature that enables multiple nodes within a failover cluster to have read-write access to the same LUN (disk).

    If that correct, what is Quorum exactly  and why we need it?

    The quorum for a cluster is determined by the number of voting elements that must be part of active cluster membership for that cluster to start properly or continue running.

    The quorum is designed to prevent so called "split-brain" scenarios, this can happen during network disruptions and the cluster nodes cannot communicate with each other. This can be prevented by using a quorum which forces only one of these groups of nodes to continue running, so only one of these groups will stay online.

    Here's a good Microsoft documentation that explains the quorum well:
    Understanding cluster and pool quorum

    Similarly, how we can differentiate disk witness with quorum or csv?

    Go through the link above and you'll get a better understanding what a quorum is and how it works, as well as the different quorum witness types there are.

    More information about the quorum can be found from the Microsoft documentation below:
    Configure and manage quorum

    Best regards,
    Leon


    Blog: https://thesystemcenterblog.com LinkedIn:

    • Marked as answer by -OSD- Saturday, April 18, 2020 5:55 PM
    Saturday, April 18, 2020 11:52 AM

All replies

  • Hi,

    Learning the Hyper V clustering, CSV are shared storage locations to store VM workloads ...correct?

    Yes, the Cluster Shared Volume (CSV) is a feature that enables multiple nodes within a failover cluster to have read-write access to the same LUN (disk).

    If that correct, what is Quorum exactly  and why we need it?

    The quorum for a cluster is determined by the number of voting elements that must be part of active cluster membership for that cluster to start properly or continue running.

    The quorum is designed to prevent so called "split-brain" scenarios, this can happen during network disruptions and the cluster nodes cannot communicate with each other. This can be prevented by using a quorum which forces only one of these groups of nodes to continue running, so only one of these groups will stay online.

    Here's a good Microsoft documentation that explains the quorum well:
    Understanding cluster and pool quorum

    Similarly, how we can differentiate disk witness with quorum or csv?

    Go through the link above and you'll get a better understanding what a quorum is and how it works, as well as the different quorum witness types there are.

    More information about the quorum can be found from the Microsoft documentation below:
    Configure and manage quorum

    Best regards,
    Leon


    Blog: https://thesystemcenterblog.com LinkedIn:

    • Marked as answer by -OSD- Saturday, April 18, 2020 5:55 PM
    Saturday, April 18, 2020 11:52 AM
  • Thanks for reply Leon, will check it out.
    Saturday, April 18, 2020 5:55 PM
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    Monday, April 20, 2020 7:01 AM
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