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With the new HA implemenation, something has changed also in the advanced options with new parameters, but also with some that now are no more available. For a list see Supported vSphere 5.0 Advanced Options.

One options that has been removed “das.failuredetectiontime”. The reason is well explained in Duncan’s HA Deep Dive:

I know many of you used this advanced setting to tweak when the host would trigger the isolation response, that is no longer possible and needed to be honest. If you’ve closely read my other articles you hopefully picked up on the datastore heartbeating part already which is one reason for not needing this anymore. The other reason is that before the isolation response is triggered the host will actually validate if virtual machines can be restarted and if it isn’t an all out network outage. Most of us have been there at some point, a network admin decides to upgrade the switches and all hosts trigger the isolation response at the same time… well that won’t happen anymore!

Some of the New vSphere 5 HA, DRS and SDRS Advanced/Hidden Options related with the datastore heartbeat are:

  • das.ignoreinsufficienthbdatastore – Disables configuration issues created if the host does nothave sufficient heartbeat datastores for vSphere HA. Defaultvalue is false.
  • das.heartbeatdsperhost – Changes the number of heartbeat datastores required. Validvalues can range from 2-5 and the default is 2.

Virtualization, Cloud and Storage Architect. Tech Field delegate. VMUG IT Co-Founder and board member. VMware VMTN Moderator and vExpert 2010-20 and vExpert Pro. Dell TechCenter Rockstar 2014-15. Microsoft MVP 2014-16. Veeam Vanguard 2015-19. Nutanix NTC 2014-20. Several certifications including: VCDX-DCV, VCP-DCV/DT/Cloud, VCAP-DCA/DCD/CIA/CID/DTA/DTD, MCSA, MCSE, MCITP, CCA, NPP.