Sunday, 7 July 2013

ESXi Keepalives


In my office, we are currently in the process of deploying ESXi hosts on Drilling Rigs. Those are placed in middle of oceans and using VSAT networks for communication.

The challenge was having those hosts connected to vCenter which is placed in our HQ where the latency can reach upto 1.5 sec.

ESX/ESXi hosts send heartbeats every 10 seconds. vCenter Server has a window of 60 seconds to receive the heartbeats. If the UDP heartbeat message is not received by vCenter Server, it treats the host as not responding.

To increase the timeout limit: 
  1. Open the C:\Documents and Settings\All Users\Application Data\VMware\VMware VirtualCenter\vpxd.cfg file (on Windows 2008, C:\ProgramData\VMware\VMware VirtualCenter\vpxd.cfg) using a text editor.

  1. Add this information in the <vpxd> tags:

    <heartbeat>
    <notRespondingTimeout>120</notRespondingTimeout>
    </heartbeat>

  1. Restart the VMware VirtualCenter Server service.

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