Category Archives: Storage

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!

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…

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?

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.

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!

VMworld Sessions with vSAN Customers


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At VMworld, there were various sessions with vSAN Customers, many of which I have met in some shape or form in the past couple of years. Some of these stories contain some great use cases or stories. Considering they are “hidden” in 60-minute sessions I figured I would write about them and share with you […]

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Posted in 6.7, 6.7 u1, customer, customers, Server, Software Defined, Storage, u1, Virtual SAN, vmworld, vsan, vSphere | Comments Off on VMworld Sessions with vSAN Customers

CTO2860BU & VIN2183BU: It is all about Persistent Memory


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I was going through the list of sessions when I spotted a session Persistent Memory by Rich Brunner and Rajesh V. Quickly after that I noticed that there also was a PMEM session by the perf team available. Both CTO2860BU and VIN2183BU I would highly recommend watching. I would recommend starting with CTO2860BU though, is it gives […]

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Posted in 6.7, persistent memory, pmem, Server, Software Defined, Storage, Virtual SAN, vSphere | Comments Off on CTO2860BU & VIN2183BU: It is all about Persistent Memory