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I have 2 hosts in a cluster (running vSphere Client version 6.7). how can i be sure that when i want to enter one of them into maintenance mode, the other one would be able to hold all VM's resources?

Thanks, John

ATX-750K
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  • Define 'hold' please, hold as in the VMs will run, or hold as in they'll bee completely uncontended? something else? – Chopper3 Aug 20 '20 at 08:28
  • Hold as all the VMs will run – ATX-750K Aug 20 '20 at 09:31
  • That's basically the same question [you asked before](https://serverfault.com/questions/1028764/host-resources-management-vsphere-client). It would have been better to expand your question instead of asking it again, if the previous answer wasn't satisfactory. – Gerald Schneider Aug 20 '20 at 10:19

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Thanks for the clarification, the function you need to enable and configure to do this is called 'admission control' within the HA service. Basically it'll stop you adding in more VM resources than the cluster could handle in the event of a certain number of host failures.

Chopper3
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  • There are some pros and cons on using Admission Control. However, it is the thing OP wants to do. Before starting using it, I would recommend to read and understand how it works. Useful links: https://www.starwindsoftware.com/blog/vsphere-6-5-ha-drs-improvements-part-i http://vmnomad.blogspot.com/2016/04/why-i-prefer-to-disable-vsphere-ha.html – Stuka Aug 23 '20 at 18:00