VMware VCENTER SERVER 4.0 - GETTING STARTED UPDATE 1 Specifications download pdf (Page 182)

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182 VMware, Inc.

Causes

The most common causes of two active servers (Split-brain syndrome) are as follows:

 Loss of the VMware Channel connection (most common in a WAN environment)

 The active server is too busy to respond to heartbeats

 Incorrect configuration of the vCenter Server Heartbeat software

You must determine the cause of the Split-brain syndrome and resolve the issue to prevent this condition from

recurring.

Resolution

To resolve a Split-brain syndrome, identify the server with the most up-to-date data. If you identify the wrong

server you risk losing data. You must reinstate the correct server.

To identify the server with the most up-to-date data

1 Check the date and time of files on both servers. Make the most up-to-date server the active server.

2 From a client PC on a LAN, run nbtstat -A 192.168.1.1 where the IP address is the Principal (Public)

IP address of the server. This can help identify the MAC address of the server currently visible to client

machines.

To resolve two active servers (Split-brain syndrome)

1 Identify the server with the most up-to-date data or the server to make active.

2 Shut down vCenter Server Heartbeat on both servers (if running).

3 On the server to make passive, right-click the Task bar icon, and select the Server Configuration wizard.

4Click the Machine tab and set the server role to passive. Do not change the identity of the server (Primary

or Secondary).

5Click Finish to accept the changes.

6 Restart this server.

7 Start vCenter Server Heartbeat, if required, and check that the Task bar icon now reflects the changes by

showing P / - (Primary and Passive) or S / - (Secondary and Passive).

8 On the active server, right-click the Task bar icon and select the Server Configuration wizard.

9Click the Machine tab and verify that the server role is set to active. Do not change the identity of the

server (Primary or Secondary).

10 Click Finish to accept the changes.

11 Restart this server. As the server restarts, it connects to the passive server and starts replication. The active

server overwrites data on the passive server.

12 Start vCenter Server Heartbeat, if required, and check that the Task bar icon now reflects the changes by

showing P / A (Primary and active) or S / A (Secondary and active).

13 Log in to the vCenter Server Heartbeat Console.

14 Check that the servers have connected and replication has started.

OTE If both active servers were servicing clients, perhaps at different WAN locations, you can make

only one server active. Both servers contain recent data that cannot be merged using vCenter Server

Heartbeat. To restart replication, make one server active and one server passive. When replication restarts,

the active server overwrites all data on the passive server. You can manually extract the up-to-date data

from the passive server prior to restarting replication. Consult the Microsoft knowledge base for

information on various tools for this purpose. For further information, contact your VMware support

representative.

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