Category Archives: vsan

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?

vSAN Stretched Cluster failure scenarios and component votes


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I was at a customer last week and had an interesting question about the vSAN voting mechanism. This customer had a stretched cluster and used RAID-5 within each location to protect the data on top of replicating across locations. During certain failure scenarios unexpectedly the data remained available, of course, it is great that you […]

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Posted in Server, Software Defined, Storage, stretched cluster, Virtual SAN, vsan | Comments Off on vSAN Stretched Cluster failure scenarios and component votes

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!

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…

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 […]

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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

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

vSAN 6.7 U1 Deep Dive book coming soon!


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Cormac and I decided to update the vSAN Essentials book. We added a whole bunch of extra info and also decided to rebrand it. “Essentials” did not really cut it, it is much more than that. Considering I just finished the Clustering Deep Dive with Frank and Niels, we figured this could be a nice […]

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Posted in 6.7 u1, Book, deep dive, Server, Software Defined, Storage, Various, Virtual SAN, vsan | Comments Off on vSAN 6.7 U1 Deep Dive book coming soon!

Want to test vSAN? Go to VMTestdrive!


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This week I had a conversation with two of my colleagues who are part of the Global Platform Engineering team, Rory and Marilyn. I had spoken with them before on this topic, but at that point, they weren’t quite ready to go all out just yet, but now they are. Rory and Marilyn and their […]

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Posted in poc, proof of concept, Server, test drive, testdrive, Virtual SAN, vsan | Comments Off on Want to test vSAN? Go to VMTestdrive!