multi site cluster

John JY 221 Reputation points


We have Windows 2016 cluster with SQL AG Role (one at production site another at DR site(
Do you still recommend to create dedicated network for heartbeats?

Also, with windows 2016 OS, the cluster network threshholds are already updated. Is there a need to twist threshholds?

Thank you for your help!

Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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  1. Limitless Technology 39,481 Reputation points

    Hello JohnJY,

    Microsoft does not recommend the use of any type of fault-tolerant adapter or "Teaming" for the heartbeat. If you require redundancy for your heartbeat connection, use multiple network adapters set to Internal Communication Only and define their network priority in the Cluster configuration. Issues seen with early multi-ported network adapters, verify that your firmware and driver are at the most current revision if you use this technology.

    No protocols other than TCP/IP should be enabled on the heartbeat adapter. Verify that all others are disabled (including such items as Network Monitor).

    Considering the twist thresholds, it isn't mandatory after the Cluster threshold is updated. but it is advisable as a precaution to go for twist thresholds.

    Hope this answers all your queries, if not please do repost back.
    If an Answer is helpful, please click "Accept Answer" and upvote it : )


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  2. John JY 221 Reputation points

    Hi @Limitless Technology ,

    This is two VMs located at two different sites away.
    only one NIC is configured. From your saying, the heartbeat network is needed in this cross subnet case,

    Thank you!

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