Author Archives: Duncan Epping

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

Free E-Book: Operationalizing VMware vSAN


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A while ago my colleague and friend Kevin Lees reached out to me and asked me if I could go over some material he wrote together with Paul Wiggett. He also asked me if I would be willing to write a foreword. When Kevin send the document over I literally finished it within a day. What […]

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Posted in Book, ebook, operations, Software Defined, Storage, Various, Virtual SAN, vsan | Comments Off on Free E-Book: Operationalizing VMware vSAN

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 […]

The post Device X is not listed on the vSAN Compatability Guide, can I still use it? appeared first on Yellow Bricks.

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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

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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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

SSH on OSX Mojave failing with broken pipe error


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I recently upgraded my Macbook to OSX Mojave (10.14.1). Ever since I upgraded whenever I want to open an SSH session to any server on the internal (VMware) network I would receive the following error message: packet_write_wait: connection to x.y.z. port 22: broken pipe Very annoying as it made deploying labs in our dev cloud very […]

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