Author Archives: Duncan Epping

What happens if all hosts in a vSphere HA cluster are isolated?


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I received this question through twitter today from Markus who was going through the vSphere 6.7 Clustering Deep Dive. And it is fairly straightforward: what happens when all hosts are isolated in a cluster, will the isolation response be triggered? @DuncanYB or @FrankDenneman I now read the HA section of #ClusteringDeepDive 2 times but I […]

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Posted in 6.7, BC-DR, ha, Server, VMware, vsphere ha | Comments

Must read white paper: Persistent Memory performance with vSphere 6.7


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Today I noticed this whitepaper titled: Persistent Memory Performance on vSphere 6.7. An intriguing topic for sure as it is something “relatively new and something I haven’t encountered too much in the field. Yes, I talk about Persistent Memory, aka NVDIMMs, in my talks usually but then it typically relates to vSAN. I have not […]

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Posted in 6.7, memory, nvdimm, performance, persistent memory, Server, vSphere | Comments

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

You asked for it: vSphere 6.7 Clustering Deep Dive ebook, now available!


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We knew when we released the paper version of the book that many would yell: What about an e-book? Although sales numbers of the Host Deep Dive and previous Clustering Deep Dive books have shown that by far most people prefer a printed copy, we decided to go ahead and create an ebook as well. […]

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Posted in 6.7, cluster, clustering deep dive, deep dive, Server, VMware, vSphere, vsphere 6.7 clustering deep dive ebook | Comments

My top VMworld session picks


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Every year I post a list of my favorite VMworld sessions, my top picks. There are way too many sessions to see, but these are definitely the sessions I would like to attend personally. That could be because of the speaker, or the content, and preferably both. Yes I know, this list will have some […]

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Posted in BC-DR, cloud, Server, Software Defined, Storage, Various, Virtual SAN, vmworld | Comments

Now Available: vSphere 6.7 Clustering Deep Dive book!


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Posted in 6.7, BC-DR, Book, cloud, clustering deep dive, deep dive, deepdive, drs, ha, Storage, Various, Virtual SAN, VMware, vSphere | Comments

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

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

Opvizor Performance Analyzer for vSAN


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At a VMUG a couple of months ago I bumped into my old friend Dennis Zimmer. Dennis told me that he was working on something cool for vSAN but couldn’t reveal what it was just yet. Last week I had a call with Dennis about what that thing was. Dennis is the CEO for Opvizor, […]

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Posted in Management & Automation, monitoring, opvizor, performance, Server, Software Defined, startup, Storage, Virtual SAN, vsan, vSphere | Comments

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