Category Archives: Server

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…

HA Admission Control Policy: Dedicated Failover Hosts


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This week I received some questions on the topic of HA Admission Control. There was a customer that had a cluster configured with the dedicated failover host admission control policy and they had no clue why. This cluster had been around for a while and it was configured by a different admin, who had left […]

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Posted in admission control, BC-DR, failover host, ha, Server, vSphere | Comments Off on HA Admission Control Policy: Dedicated Failover Hosts

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

Unexpected VMware Update Manager (VUM) baseline creation failure. Please check vSAN and VUM logs for details.


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I had a customer asking about an error they received after upgrading to 6.7 U1. The message they saw was the following: “Unexpected VMware Update Manager (VUM) baseline creation failure. Please check vSAN and VUM logs for details.” I had seen some folks on VMTN also complaining about this a couple weeks ago, and I […]

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Posted in Server, Software Defined, Storage, Virtual SAN | Comments Off on Unexpected VMware Update Manager (VUM) baseline creation failure. Please check vSAN and VUM logs for details.

Free vSAN 6.7 U1 Deep Dive ebook? Follow @VMwarevSAN closely!


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The upcoming 5 days the @VMwarevSAN twitter account will be giving away the vSAN 6.7 U1 Deep Dive book for free. Make sure to follow the account and reply to their tweets, I think around 250 books will be given away, so chances are you will be one of those lucky 250! Day 1 of […]

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Posted in Server | Comments Off on Free vSAN 6.7 U1 Deep Dive ebook? Follow @VMwarevSAN closely!

Disable Dark Mode for Outlook in OSX?!


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Yes, after the latest update MS Office is now also capable of supporting the OSX Dark Mode. Nice, but rather annoying for MS Outlook I must say, the dark mode just makes reading the different panes very challenging. I went looking for an option in the UI that allowed me to change the default, I […]

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Posted in dark mode, microsoft, osx, outlook, Server | Comments Off on Disable Dark Mode for Outlook in OSX?!

New book: VMware vSAN 6.7 U1 Deep Dive


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Cormac Hogan and I have been working late nights and weekends over the past months to update our vSAN book material. Thanks Cormac, it was once again a pleasure working with you on this project! As you may know, we released two versions of a vSAN based book through VMware Press. The book was titled […]

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Posted in 6.7, 6.7 u1, cloud, Data Recovery, deep dive, deepdive, Server, Software Defined, Storage, Virtual SAN, VMware, vsan | Comments Off on New book: VMware vSAN 6.7 U1 Deep Dive