6.5

10Troubleshooting
You can use a variety of procedures for diagnosing and xing problems that you may encounter when using
vCenter Server Heartbeat. You can use troubleshooting procedures to investigate the causes of such problems
and attempt to correct them yourself, or you can obtain assistance from VMware Technical Support. The
following unexpected behaviors illustrate Problems, Causes, and Solutions for a given scenario.
This chapter includes the following topics:
■
“Two Active or Two Passive Servers,” on page 83
■
“Synchronization Failures,” on page 86
■
“Registry Status is Out-of-Sync,” on page 88
■
“Channel Drops,” on page 89
■
“Subnet or Routing Issues,” on page 93
■
“MaxDiskUsage Errors,” on page 94
■
“Application Slowdown,” on page 97
Two Active or Two Passive Servers
When two identical servers become active on the same network or both become passive, this is not by design
and should be addressed immediately.
Two Active Servers
When two active servers are live on the same network, vCenter Server Heartbeat refers to the condition as
Split-brain syndrome. Two active servers live on the same network is critical and must be resolved immediately.
Problem
Split-brain syndrome is identied by the following symptoms:
■
Both servers in the pair are running and in an active state. The task bar icons display P / A (Primary and
active) and S / A (Secondary and active)
■
An IP address conict occurs on a server pair running vCenter Server Heartbeat on the Principal (Public)
IP address
VMware, Inc. 83