Category Archives: Server

Unable to query vSphere health information. Check vSphere Client logs for details.


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After an upgrade from 6.5 U1 to 6.5 U2 a customer received the following error in vCenter: Unable to query vSphere health information. Check vSphere Client logs for details. They looked at the log files but couldn’t get an indication of what was wrong. In this case, it was pretty simple, one of the required […]

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Posted in 6.5, 6.5 u1, 6.5 u2, Server, vCenter, vcsa | Comments Off on Unable to query vSphere health information. Check vSphere Client logs for details.

Does a vSAN IO Limit impact resync traffic?


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A question just came in, and I figured other people may have the same question so I would share it. The question was if a vSAN IO limit would impact resync traffic or for instance SvMotion? In this case the customer defines limits within each policy to ensure VMs do not interfere with other VMs […]

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Posted in hci, hyperconverged, Server, Software Defined, Storage, Virtual SAN, VMware, vsan | Comments Off on Does a vSAN IO Limit impact resync traffic?

Site locality in a vSAN Stretched Cluster?


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On the community forums, a question was asked around the use of site locality in a vSAN Stretched Cluster. When you create a stretched cluster in vSAN you can define within a policy how the data needs to be protected. Do you want to replicate across datacenters? Do you want to protect the “site local […]

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Posted in 6.7, Server, u1, u2, Virtual SAN, VMware, vmware vsan, vsan | Comments Off on Site locality in a vSAN Stretched Cluster?

Site locality in a vSAN Stretched Cluster?


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On the community forums, a question was asked around the use of site locality in a vSAN Stretched Cluster. When you create a stretched cluster in vSAN you can define within a policy how the data needs to be protected. Do you want to replicate across datacenters? Do you want to protect the “site local […]

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Posted in 6.7, Server, u1, u2, Virtual SAN, VMware, vmware vsan, vsan | Comments Off on Site locality in a vSAN Stretched Cluster?

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

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?

Free Spanish VMware technology ebook available now!


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A couple of months ago I was asked if I wanted to write a foreword for an upcoming ebook. I have done this various times, but this one was particularly interesting. Why? Well, there are 3 good reasons: This book is written by 14 community experts, many of which I have met over the past […]

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Posted in Book, ebook, Server | Comments Off on Free Spanish VMware technology ebook available now!

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

vSAN Stretched Cluster failure scenarios and component votes


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I was at a customer last week and had an interesting question about the vSAN voting mechanism. This customer had a stretched cluster and used RAID-5 within each location to protect the data on top of replicating across locations. During certain failure scenarios unexpectedly the data remained available, of course, it is great that you […]

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Posted in Server, Software Defined, Storage, stretched cluster, Virtual SAN, vsan | Comments Off on vSAN Stretched Cluster failure scenarios and component votes