Category Archives: vSphere

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

Part 1: Architect and Create Cloud Services Organizations for Skyline

In November of 2018, VMware Skyline became available as a VMware Cloud Service. The primary reason we enabled Skyline as a Cloud Services was to provide customer’s with greater control of their Skyline proactive findings and recommendations. This is pa… Continue reading

Posted in NSX, skyline, Support Experience, VMware, vSphere | Comments Off on Part 1: Architect and Create Cloud Services Organizations for Skyline

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!

VMware Skyline Update – February 2019

We’re back with our February VMware Skyline update. We didn’t release any major enhancements to Skyline this month, however we did add additional proactive findings, as well as updated our documentation to reflect recent changes. Let’s get started by r… Continue reading

Posted in proactive support, skyline, Support Experience, vSphere | Comments Off on VMware Skyline Update – February 2019

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…