Yellow Bricks

by Duncan Epping

Single socket vSAN ready node AMD EPYC Rome on the VCG!

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Yesterday I tweeted something and I want to reiterate it to make sure that those who are just following the blog, and not my twitter account, also are aware. On the vSAN Compatibility Guide (VCG) there were already a number of single-socket servers, but most of these were limited in terms of CPU/MEM resources. Last week two new servers were added to the VCG. These servers are based on the AMD EPYC Rome CPUs and can have up to 64 cores. Yes, 64 cores per CPU. They can go up to 2TB worth of memory, depending on the DIMMS used, also while on the topic of memory, the NUMA implementation completely changed with AMD EPYC Rome, but I am sure Frank Denneman will have something to say about that soon. Why would I bring these servers up? Well, for those looking to do 2-node vSAN configurations or smaller vSAN clusters, they could be a great alternative solution! Heck, I would consider them in general I think.

2 node direct connect vSAN and error “vSphere HA agent on this host could not reach isolation address”

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I’ve had this question over a dozen times now, so I figured I would add a quick pointer to my blog. What is causing the error “vSphere HA agent on this host could not reach isolation address” to pop up on a 2-node direct connect vSAN cluster? The answer is simple, when you have vSAN enabled HA uses the vSAN network for communication. When you have a 2-node Direct Connect the vSAN network is not connected to a switch and there are no other reachable IP addresses other than the IP addresses of the vSAN VMkernel interfaces.

When HA tries to test if the isolation address is reachable (the default gateway of the management interface) the ping will fail as a result. How you can solve this is simply by disabling the isolation response as described in this post here.

I discovered .PNG files on my datastore, can I delete them?

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I noticed this question on Reddit about .PNG which were located in VM folders on a datastore. The user wanted to remove the datastore from the cluster but didn’t know where these files were coming from and if the VM required those files to be available in some shape or form. I can be brief about it, you can safely delete this .PNG files. These files are typically created by VM Monitoring (part of vSphere HA) when a VM is rebooted by VM Monitoring. This is to ensure you can troubleshoot the problem potentially after the reboot has occurred. So it takes a screenshot of the VM to for instance capture the blue screen of death. This feature has been in vSphere for a while, but I guess most people have never really noticed it. I wrote an article about it when vSphere 5.0 was released and below is the screenshot from that article where the .PNG file is highlighted. For whatever reason I had trouble finding my own article on this topic so I figured I would write a new one on it. Of course, after finishing this post I found the original article. Anyway, I hope it helps others who find these .PNG files in their VM folders.

Oh, and I should have added, it can also be caused by vCloud Director or be triggered through the API, as described by William in this post from 2013.

My recommended sessions for VMworld Europe 2019!

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I created a list of recommended sessions for VMworld US, so I figured I would do the same for VMworld Europe. I am limiting it to 15 sessions for Europe and removed some of the sessions I had listed for the US and added some others for EMEA. I personally have 2 sessions scheduled at the moment, and they filled up rather fast in the US, so make sure to register early: HCI1870BE and HBI2186BE.

Okay, here’s my top 15 list, please note that this is pretty much in random order:

  • 60 Minutes of Non-Uniform Memory Architecture [HBI2278BE] by Frank Denneman
    This session got raving reviews in the US, I attended it personally and I can highly recommend it. That is if you think your brain can handle it… it is deep!
  • PowerCLI Deep Dive [HBI1729BE] by Luc Dekens and Kyle Ruddy
    What can I say? These guys speak PowerCLI. They know it inside out, just make sure you are ready to go deep!
  • VMware Cloud Foundation Deep Dive [HBI2044BE] by Jason Shaw
    I am a big fan of full-stack HCI solutions, and in this session, Jason talks about what VMware Cloud Foundation brings to the table.
  • HCI Management: Current and Future [HCI1207BE] by JunChi Zhang and Christian Dickmann
    Every year these guys bring some really cool demos and they expect you to provide feedback at the end of the session. So if you want to have a chance to influence vSAN/vSphere, attend this one!
  • Project Pacific Technical Overview: Unifying vSphere and Kubernetes [HBI4500BE] by Michael West and Jared Rosoff
    There was a lot of buzz surrounding the announcement of Project Pacific. I managed to sit in one or two sessions in the US, and knowing Jared was the lead engineering on this project I suspect that this session may even go deeper than the ones I attended in the US.
  • The Virtually Speaking Podcast Live: The Future of Storage [HCI1894PE] by Pete Flecha, John Nicholson, and guests
    I was a guest on the US in this session, it was a lot of fun. A lively discussion, and great questions from the audience on top of that. Plus, it is amazing to see Pete Flecha do the intro and outro live, I always thought that was pre-recorded!
  • The Cloud Backbone Network: A Paradigm Shift in Corporate WAN [OCTO1911BE] by Israel Cidon
    I have seen a session on this topic by Israel at an internal conference and it was nothing short of mind-blowing. I would highly recommend attending this if you want to learn more about how we could potentially improve corporate WANs in the future by leveraging SD-WAN technology. Mind, this session is foreward looking!
  • Showcase Keynote: HCI – The Foundation for your Future-proof Infrastructure [HCI3551KE] by Cormac Hogan and John Gilmartin
    I presented this session in the US with John, Cormac will be presenting it in Europe with John. I am sure it will be filled with great demos once again, and I will definitely try to attend this one in person
  • Leveraging the Latest Server Technologies in vSphere [HBI2362BE] by Niels Hagoort
    This session wasn’t on my list for the US, but after watching the recording I feel it is worth attending in person! A good overview of what we are doing with the latest HW technologist in vSphere.
  • vSphere Virtual Volumes: Technical Deep Dive [HBI2853BE] by Jason Massae and Thiruvengada Govinda Thirumal
    The adoption of vVols is growing fast, and it is for a good reason. Jason and Thiruvengada will explain in-depth what vVols is and how it works, and of course what the benefits are of adopting it.
  • Tech Preview of Site Recovery Manager with Virtual Volumes [HCI2894BE] by Stefan Tsonev and Velina Krasteva
    The tech preview of SRM for vVols has been discussed various times, but in this session by Stefan and Velina it is also demonstrated. So if you are interested in disaster recovery solutions in combination with vVols then this is one to attend!
  • Meet the [ML] Driver of the Self-Driving Datacenter [MLA1904BE] by Jad El-Zein and Arun Annavarapu
    At VMworld US Project Magna was unveiled, VMware’s effort to deliver the self-driving datacenter. A very interesting concept, which is explained in this session by Jad and Arun. I’ve seen some of the work, and it has a lot of potential, highly recommend attending this session!
  • Technical Deep Dive on Cloud Native Storage 1.0 [HCI2763BE] by Cormac Hogan and Myles Gray
    Cormac and Myles are the Cloud Native experts in our business unit, and I can guarantee that this will be a great session filled with cool demos.
  • Optimizing vSAN for Performance [HCI1757BE] by Paudie ORiordan
    If anyone can explain how to optimize vSAN, how to do benchmarking, and what to avoid… it is Paudie. On top of that, he is a great speaker and you can basically ask him anything on the topic of storage. Must see!
  • Innovations in vMotion: Features, Performance, and Best Practices [HBI1421BE] by Sreekanth Setty and Arunachalam Ramanathan
    I watched this session in the US, it provides an excellent overview of the enhancements introduced for vMotion to improve vMotion (and switch over) times. They also talk about some enhancements coming in the near future. Very interesting stuff.

Scheduling opens up tomorrow (24th of September), so make sure to hit the portal early. I guarantee that many of the sessions above will be full in a matter of days. So don’t say I did not warn you in advance!

Capacity Overview in vSAN 6.7 U3

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I just wanted to do a short post before the weekend, in vSAN 6.7 U3 there’s a great capacity overview screen. It shows a couple of things, first of all, it provides a simple bar that shows “data written”, “reserved space” and “free space”. The second section provides you the ability to figure out what happens to your capacity consumption if you would change the policy on all VMs. The third section gives you a nice breakdown of the capacity per category and a great circular diagram which shows immediately what kind of data is consuming your capacity. Very useful!