Category Archives: Server

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

How to test failure scenarios!


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Almost on a weekly basis, I get a question about unexpected results during the testing of certain failure scenarios. I usually ask first if there’s a diagram that shows the current configuration. The answer is usually no. Then I would ask if they have a failure testing matrix that describes the failures they are introducing, […]

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Posted in BC-DR, failure scenario, Server, Software Defined, Storage, test, testing, Virtual SAN, vmsc, VMware, vsan, vSphere | Comments Off on How to test failure scenarios!

Top 10 VMware tools podcast and RVTools 3.11.6


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Right after we finished recording the Virtually Speaking Podcast on the topic of VMware Tools (Listen to it, great episode featuring Pete, John, William Lam and myself) yesterday I received an email from Rob. Rob mentioned an update to RVTools, bringing it now to version 3.11.6. As I mentioned on the podcast, RVTools has been […]

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Posted in cloud, cool tool, Management & Automation, rvtools, Server | Comments Off on Top 10 VMware tools podcast and RVTools 3.11.6

DQLEN changes, what is going on?


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I had a question this week on twitter, it was about the fact that DQLEN changes to values well below it was expected to be (30) in esxtop for a host. There was latency seen and experienced seen for VMs so the question was why is this happening and wouldn’t a lower DQLEN make things […]

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Posted in Server, sioc, Software Defined, Storage, Various, vmfs, VMware, vSphere | Comments Off on DQLEN changes, what is going on?

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…