Category Archives: ha

This host has no isolation addresses defined as required by vSphere HA


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I had a comment on one of my 2-node vSAN cluster articles that there was an issue with HA when disabling the Isolation Response. The isolation response is not required for 2-node as it is impossible to properly detect an isolation event and vSAN has a mechanism to do exactly what the Isolation Response does: kill the […]

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Posted in 6.5, 6.7, ha, isolation address, isolation response, Server, vsan, vsphere ha | Comments Off on This host has no isolation addresses defined as required by vSphere HA

Black Friday Gift: Free copy of the vSphere 6.7 Clustering Deep Dive, thanks Rubrik (ebook)


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Many asked us if the ebook would be made available for free again. Today I have the pleasure of announcing that Frank, Niels and I have worked once again with Rubrik and the VMUG organization to make the vSphere 6.7 Clustering Deep Dive book available for free! Yes, that is 0 USD / EURO, or […]

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Posted in 6.7, clustering, clustering deep dive, deep dive, drs, ebook, ha, rubrik, Server, Various, vSphere | Comments Off on Black Friday Gift: Free copy of the vSphere 6.7 Clustering Deep Dive, thanks Rubrik (ebook)

HA Futures: Per VM Admission Control – Part 4 of 4 – (Please comment!)


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As admission control hasn’t evolved in the past years, we figured we would include another potential Admission Control change. Right now when you define admission control you do this cluster-wide. You can define you want to tolerate 1 failure for instance, but some VMs simply may be more important than other VMs. What do you […]

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HA Futures: VMCP for Networking – Part 3 of 4 – (Please comment!)


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VMCP, or VM Component Protection, has been around for a while. Many of you are probably using this to mitigate storage issues. However, what if the VM network fails? Well, that is a problem right now… if the VM network fails then there’s no response from HA. This by many customers is considered to be […]

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HA Futures: VMCP for Networking – Part 3 of 4 – (Please comment!)


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VMCP, or VM Component Protection, has been around for a while. Many of you are probably using this to mitigate storage issues. However, what if the VM network fails? Well, that is a problem right now… if the VM network fails then there’s no response from HA. This by many customers is considered to be […]

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HA Futures: Admission Control – Part 2 of 4 – (Please comment, feedback needed!)


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Admission Control is always a difficult topic when I talk to customers. It seems that many people still don’t fully grasp the concept, or simply misunderstand how it works. To be honest, I can’t blame them. It doesn’t always make sense when you think things through. Most recently for Admission Control we introduced a mechanism […]

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HA Futures: Orchestrated Restart and Restart Priority – Part 1 of 4 – (Please comment!)


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Last week I visited Palo Alto. I had a long conversation with my friends from the vSphere HA team. I have done a series of articles in the past asking for feedback/comments on future features/functions of HA that the team is looking to implement. One of the first features I would like to discuss is […]

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HA Admission control: How can I check how much reserved resources are used?


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I had this question twice in the past three months, so somehow this is something which isn’t clear to everyone. With HA Admission Control you set aside capacity for fail-over scenarios, this is capacity which is reserved. But of course VMs also use reservations, how can you see what the total combined used reserved capacity […]

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Posted in 6.0, 6.5, 6.7, admission control, BC-DR, Book, cloud, drs, ha, Server, u1, vSphere | Comments Off on HA Admission control: How can I check how much reserved resources are used?

VMworld Video: vSphere 6.7 Clustering Deep Dive


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As all videos are posted for VMworld (and nicely listed by William), I figured I would share the session Frank Denneman and I presented. It ended up in the Top 10 Sessions on Monday, which is always a great honor. We had a lot of positive feedback and comments, thanks for that! Most importantly, it […]

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Posted in BC-DR, clustering, Data Recovery, deep dive, drs, ha, Various, vmworld, vSphere | Comments Off on VMworld Video: vSphere 6.7 Clustering Deep Dive

What happens if all hosts in a vSphere HA cluster are isolated?


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I received this question through twitter today from Markus who was going through the vSphere 6.7 Clustering Deep Dive. And it is fairly straightforward: what happens when all hosts are isolated in a cluster, will the isolation response be triggered? @DuncanYB or @FrankDenneman I now read the HA section of #ClusteringDeepDive 2 times but I […]

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