Category Archives: 6.7

Impact of adding Persistent Memory / Optane Memory devices to your VM


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I had some questions around this in the past month, so I figured I would share some details around this. As persistent memory (Intel Optane Memory devices for instance) is getting more affordable and readily available more and more customers are looking to use it. Some are already using it for very specific use cases, […]

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Posted in 6.7, intel, optane memory, persistent memory, Server, Storage, u1, u2, vSphere | Comments Off on Impact of adding Persistent Memory / Optane Memory devices to your VM

DRS Advanced Setting IsClusterManaged


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On Reddit, someone asked what DRS advanced setting IsClusterManaged does and if it is even legit. I can confirm it is legit, it is a setting which was introduced to prevent customers from disabling DRS while the cluster is managed by vCloud Director for instance. As disabling DRS would lead to deleting resource pools for […]

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Posted in 6.5, 6.7, cloud, drs, u1, u2, vcd, vCloud Director, vSphere | Comments Off on DRS Advanced Setting IsClusterManaged

I want vSphere HA to use a specific Management VMkernel interface


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This comes up occasionally, customers have multiple Management VMkernel interfaces and see vSphere HA traffic on both of the interfaces, or on the incorrect interface. In some cases, customers use the IP address of the first management VMkernel interface to connect the host to vCenter and then set an isolation address that is on the […]

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Posted in 6.0, 6.5, 6.7, ha, High Availability, Server, VMware, vSphere | Comments Off on I want vSphere HA to use a specific Management VMkernel interface

Mixing versions of ESXi in the same vSphere / vSAN cluster?


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I have seen this question being asked a couple of times in the past months, and to be honest I was a bit surprised people asked about this. Various customers were wondering if it is supported to mix versions of ESXi in the same vSphere or vSAN Cluster? I can be short whether this is […]

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Posted in 6.5, 6.7, Server, Storage, u1, u2, Virtual SAN, VMware, vsan, vSphere | Comments Off on Mixing versions of ESXi in the same vSphere / vSAN cluster?

vSphere HA virtual machine failed to failover error on VMs in a partitioned cluster


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I received two questions this week around partition scenarios where after the failure has been lifted some VMs display the error message “vSphere HA virtual machine failed to failover”. The question that then arises is: why did HA try to restart it, and why did it fail? Well, first of all, this is an error […]

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Posted in 6.0, 6.5, 6.7, BC-DR, failure scenario, ha, Server, testing, VMware, vSphere | Comments Off on vSphere HA virtual machine failed to failover error on VMs in a partitioned cluster

Changed advanced setting VSAN.ClomRepairDelay and upgrading to 6.7 u1? Read this…


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If you changed the advanced setting VSAN.ClomRepairDelay to anything else than the default 60 minutes there’s a caveat during the upgrade to 6.7 U1 you need to be aware of. When you do this upgrade the default is reset, meaning the value is configured once again to 60 minutes.  It was reported on twitter by “Justin […]

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Posted in 6.7, 6.7 u1, Server, Software Defined, Storage, update, Upgrade, Virtual SAN, vsan, vSphere | Comments Off on Changed advanced setting VSAN.ClomRepairDelay and upgrading to 6.7 u1? Read this…

Device X is not listed on the vSAN Compatability Guide, can I still use it?


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I get this question almost daily, and I am pretty sure I have said this various times, but just in case it wasn’t clear I figured I would share the answer to the question whether a device should be used in a vSAN cluster when it is not listed on the vSAN Compatibility Guide? if you […]

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Posted in 6.5, 6.6, 6.7, 6.7 u1, Software Defined, Storage, Virtual SAN, VMware, vsan | Comments Off on Device X is not listed on the vSAN Compatability Guide, can I still use it?

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

New book: VMware vSAN 6.7 U1 Deep Dive


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Cormac Hogan and I have been working late nights and weekends over the past months to update our vSAN book material. Thanks Cormac, it was once again a pleasure working with you on this project! As you may know, we released two versions of a vSAN based book through VMware Press. The book was titled […]

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Posted in 6.7, 6.7 u1, cloud, Data Recovery, deep dive, deepdive, Server, Software Defined, Storage, Virtual SAN, VMware, vsan | Comments Off on New book: VMware vSAN 6.7 U1 Deep Dive

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)