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docs/linux/sql-server-ha-linux-basics.md

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@@ -198,7 +198,7 @@ A Pacemaker cluster does not have the concept of dependencies, but there are con
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#### Quorum, fence agents, and STONITH
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Quorum under Pacemaker is somewhat similar to a WSFC in terms of concept. The whole purpose of a cluster’s quorum mechanism is to ensure that the cluster stays up and running. Both a WSFC and the HA add ons for the Linux distributions have the concept of voting, where each node counts towards quorum. You want a majority of the votes up, otherwise, in a worst case scenario, the cluster will be shut down.
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Unlike a WSFC, there is no witness resource to work with quorum. Like a WSFC, the goal is to keep the number of voters odd. The individual sections for [AGs] and [FCIs] discuss quorum for those configurations, since they each have different considerations.
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Unlike a WSFC, there is no witness resource to work with quorum. Like a WSFC, the goal is to keep the number of voters odd. The individual articles for [Always On Availability Groups] and [Failover Cluster Instances] discuss quorum for those configurations, since they each have different considerations.
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WSFCs monitor the status of the nodes participating and handle them when a problem occurs. Later versions of WSFCs offer such features as quarantining a node that is misbehaving or unavailable (i.e. node is not on, network communication is down, etc.). On the Linux side, this type of functionality is provided by a fence agent. The concept is sometimes referred to as fencing. However, these fence agents are generally specific to the deployment, and often provided by hardware vendors and some software vendors, such as those who provide hypervisors. For example, VMware provides a fence agent that can be used for Linux VMs virtualized using vSphere.
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