Yellow Bricks

by Duncan Epping

Why does HA not power-on VMs after a full cluster shutdown?

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I received this question and figured I would write a quick post about it, as it comes up occasionally. Why does vSphere HA no power-on VMs after a full cluster is brought back online after a full cluster shutdown? In this case, the customer had a power outage, so their hosts and all VMs were powered off, by an administrator cleanly, as a result of the backup power unit running out of power. Unfortunately, this happens more frequently than you would think.

When VMs are powered off by an administrator, or anyone/anything (PowerCLI etc) else which has permissions to power off VMs, then vCenter Server will mark these VMs as “cleanly powered off”. Next, also the state of the VMs is tracked by vSphere HA. So if a host is powered off, HA will know if the VM was powered on, or powered off at the time the host goes missing.

Now, when the host (or hosts) returns for duty, vSphere HA will of course verify what the last known state was of the cluster. It will read the list of all the VMs that were powered on, and it will restart those that were powered on and are configured for HA. It will also look at a VM property called “runtime.cleanPowerOff”, this property indicates if the VM was cleanly powered off by an Admin or a script, or if the VM was for instance powered off by vSphere HA itself. (PDL response etc.) Depending on the value of the property, the VM will, or will not be restarted.

Having said all of that, when you power off a VM manually through the UI, or via a script, then the VM will be marked as being “cleanly powered off”. This means that HA has no reason to restart it, as the powered-off VM is not the result of a host, network, or storage failure.

Unexplored Territory #005: AI Enterprise, DPUs, and NVIDIA Launchpad with Luke Wignall

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Episode 005 is out! This time we talk to Luke Wignall, who is the Director of Technical Product Marketing at NVIDIA. We talk about some of the announcements made during the NVIDIA GTC Conference. Luke discusses NVIDIA Launchpad, AI Enterprise, and of course, we touch on DPUs aka SmartNICs. A great conversation with A LOT of information to digest. Enjoy the episode, and if you haven’t done so yet, make sure to subscribe! You can also listen via your podcast apps of course for Apple: https://apple.co/3lYZGCF, Google: https://bit.ly/3oQVarH, Spotify: https://spoti.fi/3INgN3R.

Unexplored Territory #004: vVols with Cody Hosterman!

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Episode 004 is out! This time we talk to Cody Hosterman, Director of Product Management at Pure Storage, about Virtual Volumes aka vVols! Cody shares with us the past, present, and future of vVols. I especially enjoyed his explanations around the benefits of vVols for traditional and cloud-native workload. It is also great to hear that VMware is working with Pure Storage on designing and developing a stretched cluster capability for vVols based environments. Listen below, or via Apple, Google, Spotify etc.

Can I boot ESXi from an SD card while placing OSDATA on my SAN?

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I see this question popping up all the time, literally twice a day on our VMware internal slack, can I boot ESXi from an SD card while placing OSDATA on my SAN? I guess people are confused after reading this article. It is probably a result of skim-reading as the article is in-depth and spells it out to the letter. If you look at the following table then it mentions FCoE and iSCSI:

However, FCoE, iSCSI, and FC would only be supported when you boot from SAN, only then is OSDATA supported on a SAN device. When you boot from USB/SD, OSDATA will need to reside on a locally attached device. In other words, the answer to the original question is: no you cannot boot ESXi from an SD card and place OSDATA on your SAN. Again, for details, read this excellent document.

Unexplored Territory #003: EUC strategy and vision with Shawn Bass

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We just published the third episode of the Unexplored Territory. This time we are talking to Shawn Bass, who is the CTO for the EUC business unit. Shawn talks about various aspects of End User Computing, especially security is a big focus at the moment, aka zero trust. Make sure to listen to the episode, either via the embedded player below, or just add the podcast to your podcast app (google, apple, overcast etc), or spotify, and listen to it that way.