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Vhost Failover Ordering, Auto Failback and Expected Behavior

Last Updated: Oct 25, 2016 02:27PM PDT

Summary

The expected behavior when disabling nodes and forcing the failover of Vhosts.

Information

If a Vhost has "Auto failback" disabled and a host ordering of Node1, Node2 and Node3 (as shown in the "Node order" section of the Vhost properties), then the following is the expected behavior assuming that the Vhost is currently active on Node1:

  • Right-click > "Stop virtual host" on Node1
  • Vhost will failover to Node2
  • Right-click > "Stop virtual host" on Node2
  • Vhost will failover to Node3

This is because with "Auto failback" disabled the failover ordering follows the node list defined by the Vhost properties.

If a Vhost has "Auto failback" enabled and a host ordering of Node1, Node2 and Node3, then the following is the expected behavior assuming that the Vhost is currently active on Node1:

  • Right-click > "Stop virtual host" on Node1
  • Vhost will failover to Node2
  • Right-click > "Stop virtual host" on Node2
  • Vhost will failback to Node1

From the DxEnterprise Administration Guide - Virtual Hosts - Page 35:

Auto Failback
This policy is intended to return the Virtual Host to its original configuration, or as close to it as possible. After the Virtual Host fails over to a backup node, DxEnterprise watches the health of the nodes that are higher in the list of nodes configured for that Virtual Host. When the health of one of these nodes is equal to or greater than the backup node where the Virtual Host currently resides, the Virtual Host will automatically attempt to fail over to that node.

Applies to...

  • DxEnterprise 15.0
  • DxEnterprise 15.5
  • DxEnterprise 16.0
  • DxConsole

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