Category Archives: vsphere ha

2 node direct connect vSAN and error “vSphere HA agent on this host could not reach isolation address”

Posted on October 7, 2019 by Duncan Epping


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I’ve had this question over a dozen times now, so I figured I would add a quick pointer to my blog. What is causing the error “vSphere HA agent on this host could not reach isolation address” to pop up on a 2-node direct connect vSAN cluster? The answer is simple, when you have vSAN […] Continue reading →

Posted in 2-node, direct connect, ha, isolation response, Server, Software Defined, Storage, Various, Virtual SAN, vsan, vsphere ha | Comments Off on 2 node direct connect vSAN and error “vSphere HA agent on this host could not reach isolation address”

I discovered .PNG files on my datastore, can I delete them?

Posted on September 26, 2019 by Duncan Epping


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I noticed this question on Reddit about .PNG which were located in VM folders on a datastore. The user wanted to remove the datastore from the cluster but didn’t know where these files were coming from and if the VM required those files to be available in some shape or form. I can be brief […] Continue reading →

Posted in ha, High Availability, screenshot, Server, vm monitoring, vsphere ha | Comments Off on I discovered .PNG files on my datastore, can I delete them?

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

Posted on December 19, 2018 by Duncan Epping


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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

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

Posted on August 15, 2018 by Duncan Epping


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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 […]

The post What happens if all hosts in a vSphere HA cluster are isolated? appeared first on Yellow Bricks.

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Posted in 6.7, BC-DR, ha, Server, VMware, vsphere ha | Comments Off on What happens if all hosts in a vSphere HA cluster are isolated?

Trigger APD on iSCSI LUN on vSphere

Posted on June 21, 2018 by Duncan Epping


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I was testing various failure scenarios in my lab today for the vSphere Clustering Deepdive session I have scheduled for VMworld. I needed some screenshots and log files of when a datastore hit an APD scenario, for those who don’t know APD stands for all paths down. In other words: the storage is inaccessible and […]

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Posted in 6.0, 6.5, 6.7, apd, ha, High Availability, PDL, Server, Storage, VMware, vsphere ha | Comments Off on Trigger APD on iSCSI LUN on vSphere

Insufficient configured resources to satisfy the desired vSphere HA failover level

Posted on December 9, 2017 by Duncan Epping


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I was going over some of the VMTN threads and I noticed an issue brought up with Admission Control a while ago. Completely forgot about it until it was brought up again internally. With vSphere 6.5 and vSphere HA there seems to be a problem with some Admission Control Policies. When you for instance have […]

“Insufficient configured resources to satisfy the desired vSphere HA failover level” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.

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Insufficient configured resources to satisfy the desired vSphere HA failover level

Posted on December 9, 2017 by Duncan Epping


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I was going over some of the VMTN threads and I noticed an issue brought up with Admission Control a while ago. Completely forgot about it until it was brought up again internally. With vSphere 6.5 and vSphere HA there seems to be a problem with some Admission Control Policies. When you for instance have […]

“Insufficient configured resources to satisfy the desired vSphere HA failover level” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.

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Posted in 6.5, ha, Storage, Various, vSphere, vsphere ha | Comments Off on Insufficient configured resources to satisfy the desired vSphere HA failover level

Using HA VM Component Protection in a mixed environment

Posted on November 29, 2017 by Duncan Epping


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I have some customers who are running both traditional storage and vSAN in the same environment. As most of you are aware, vSAN and VMCP do not go together at this point. So what does that mean for traditional storage, as in with traditional storage for certain storage failure scenarios you can benefit from VMCP. […]

“Using HA VM Component Protection in a mixed environment” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.

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Posted in 6.5, 6.6, apd, ha, PDL, Server, Software Defined, Storage, Various, Virtual SAN, vmcp, VMware, vsan, vsphere ha | Comments Off on Using HA VM Component Protection in a mixed environment

VM showing that HA failure response is disabled in 6.5?

Posted on April 11, 2017 by Duncan Epping


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I had a customer asking me today why on each VM it was showing that all HA responses are disabled. This customer is running vSphere 6.5 and below you can see what the UI showed. Note that it still says the VM is Protected, yet none of the protection mechanisms appeared to be enabled I […]

“VM showing that HA failure response is disabled in 6.5?” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.

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Partition / Isolation and VM flip flopping between hosts?

Posted on May 16, 2016 by Duncan Epping


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Last week I was talking to one of our developers at our R&D offsite. He has a situation where he saw his VM flip flopping between two hosts when he was testing a certain failure scenario and he wondered why that was. In his case he had a 2 node cluster connected to vCenter Server […]

“Partition / Isolation and VM flip flopping between hosts?” originally appeared on Yellow-Bricks.com. Follow me on twitter – @DuncanYB.

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Posted in BC-DR, ha, isolation, Server, vsphere ha | Comments Off on Partition / Isolation and VM flip flopping between hosts?