Clustering

  • Hi,

    In active/active two nodes sql cluster, do i need two seperate quorum resource, one for each SQL instance OR do i just need one quorum resource and both SQL instances will share same Quorum resource?

    Thanks in Advance.

  • No is the short answer.

    When you create a Windows SQL Cluster there are at least 2 parts (Windows 2003, 3 for Windows 2008)

    1. an OS Cluster that controls the Quroum (you only need/will ever have 1 per cluster)

    2. The SQL Cluster

    3. (for Windows 2008) an MS DTC Cluster

    4. (for named instances) An Additional SQL Cluster (number 4 repeates based on the number of named instances)

    any MS cluster is by default created in an Active/Passive manner.

    The only way to make a cluster Active/Active is to have resources belong to the normally passive node.

    For example a 2 Node Cluster Windows 2003:

    Node 1 could own Disk M for Data and N for Logs

    Node 2 could own the Quroum

    or A cluster with a default SQL instance and a Named Instance

    Node 1 could own Disk M for Data and N for Logs on the Default instance, and the Quroum

    Node 2 could own Disk S for Data and W for Logs on the Named Instance

    Active/Active is just using both nodes actively, if a failover occurs from one Node to another all resources would be shifted to the non-failed Node.

    Now this is presuming you have a standard cluster, are you using Standard or Majority Node Set?

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