Category Archives: 6.5

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

HA Admission control: How can I check how much reserved resources are used?


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I had this question twice in the past three months, so somehow this is something which isn’t clear to everyone. With HA Admission Control you set aside capacity for fail-over scenarios, this is capacity which is reserved. But of course VMs also use reservations, how can you see what the total combined used reserved capacity […]

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Posted in 6.0, 6.5, 6.7, admission control, BC-DR, Book, cloud, drs, ha, Server, u1, vSphere | Comments Off on HA Admission control: How can I check how much reserved resources are used?

What happened to MaxCostPerEsx41DS? It doesn’t seem to work in vSphere 6.x?


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Today I received a question which also caught me by surprise, someone updated from vSphere 5.0 and he noticed that when doing an SDRS Maintenance Mode that the setting MaxCostPerEsx41DS did not work. This setting actually limits the number of active SvMotions on a single datastore. You can imagine that this can be desired when […]

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Posted in 6.0, 6.5, 6.7, limit, MaxCostPerEsx41DS, MaxCostPerEsx6xDS, Storage, SvMotion, vSphere | Comments Off on What happened to MaxCostPerEsx41DS? It doesn’t seem to work in vSphere 6.x?

Insufficient configured resources to satisfy the desired vSphere HA failover level on the cluster


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I was talking to the HA team this week, specifically about the upcoming HA book. One thing they mentioned is that people still seem to struggle with the concept of admission control. This is the reason I wrote a whole chapter on it years ago, yet there still seems to be a lot of confusion. […]

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Posted in 6.5, 6.7, admission control, BC-DR, ha, Server, VMware, vSphere | Comments Off on Insufficient configured resources to satisfy the desired vSphere HA failover level on the cluster

vSphere 6.5 and limits, do they still apply to SvMotion?


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I had a question this week and I thought I wrote about this before but apparently, I did not. Hopefully by now most of you the I/O scheduler has changed over the past couple of years. Within ESXi, we moved to a new scheduler, which often is referred to as mClock. This new scheduler, and a […]

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Posted in 6.5, limit, mclock, scheduler, Server, sioc, Storage, Various, vSphere | Comments Off on vSphere 6.5 and limits, do they still apply to SvMotion?

Adding a fifth (virtual) ESXi host to vCenter Foundation


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When running a 4 node stretched cluster environment it should be possible to use “cheaper” vCenter Server licenses, namely vCenter Foundation. One of the limitations of vCenter Foundation is that you can only manage 4 hosts with it. This is where some customers who wanted to manage a stretched cluster hit some issues. The issue […]

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Posted in 6.5, BC-DR, Server, Software Defined, Storage, u2, Virtual SAN, VMware, vsan, vSphere | Comments Off on Adding a fifth (virtual) ESXi host to vCenter Foundation

Trigger APD on iSCSI LUN on vSphere


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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

Module MonitorLoop power on failed error when powering on VM on vSphere


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I was playing in the lab for our upcoming vSphere Clustering Deepdive book and I ran in to this error when powering on a VM. I had never seen it before myself, so I was kind of surprised when I figured out what it was referring to. The error message is the following: Module MonitorLoop […]

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Posted in 6.0, 6.5, 6.7, error, ESXi, Management & Automation, Server, Various, vSphere | Comments Off on Module MonitorLoop power on failed error when powering on VM on vSphere

Customer Experience Improvement Program: where, when and what?


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I got a question on my post about the Customer Experience Improvement Program (ceip) demo, the questions boiled down to the following: What is being send to VMware Where is the data stored by VMware When is the data send to VMware (how often) The “what” question was easy to answer, as this was documented […]

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Posted in 6.5, 6.7, ceip, Server, support, VMware, vsan, vSphere | Comments Off on Customer Experience Improvement Program: where, when and what?