Mar
22
2018

NLVMUG 2018

This week, I had the opportunity to speak at the Dutch VMUG (NLVMUG) about a project I did last year.

Title of my session was: Migrate your datacenter without downtime

Session abstract
Moving a complete datacenter 50 KM, without downtime?
A few years ago this was unthinkable, but with the help of VMware techniques this is possible nowadays. In this customer case, Michael Wilmsen shows you how he did this for a university, using VMware techniques and PowerCLI. Not only the process of script development, but you will also get a better understanding of how the VMware techniques work and how they are applicable.

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Oct
6
2017

Testdrive Infinio Accelerator 3.0

Nowadays, many legacy storage devices (SAN/NAS) have the option for hosting flash devices in their solution. Flash devices leverage high IOPS and low latency.
Most common used storage protocols (iSCSI, NFS and even Fiber Channel) are bandwidth optimized, and are not latency optimized. Of course Fiber Channel (FC) has a lower latency, as Ethernet based protocols like iSCSI and NFS. But still remote device will have a higher latency as local devices. In this blog post from Mellanox, they explain why FC is doomed according to them.

In the past I wrote a blog post explaining why you want your flash devices as close as possible to your applications. Hence why Hyper Converged Infrastructure (HCI) are so popular nowadays.

But what if you have a legacy storage solution, and still want low latency for your applications?

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Sep
7
2017

VMworld 2017 US Recap

This year, I was rewarded with a blogger pass for VMworld.

In this blogpost I want to highlight, what was striking to me.

Solutions exchange

Every year I like to walk around the Solution Exchange, talking with vendors and learning about their solutions.
What was surprising to me this year, was the size and the quality of boots. Comparing to other VMworld, the boots where much larger and had more lighting and some of the even LED screens. I know that the development and a spot on the Solution Exchange is not cheap, so clearly these vendors see the importance of being present and want to invest in an event like VMworld.

Sessions

I’ve attended a couple of sessions, as most session are recorded and can be watched online after VMworld. The sessions I’ve attended, these sessions were striking to me.
Most of these session will also be in VMworld Barcelona.

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Aug
3
2017

VMworld US 2017

VMworld US is in a few weeks. This year I have been lucky to get a blogger pass from VMware. Every year I go to Barcelona, and if I can, also to VMworld US. For me VMworld US is more interesting. Why?

One of the main reason why go to VMworld, is the Solution Exchange (SOL). The SOL is a great place to meet a lot of different vendors who add value to the VMware portfolio. Talking with the people from the traditional vendors, is always great. You get a good understanding what they’re up to. What will be available in the near future, and their future roadmaps (nothing guaranteed of course).

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May
23
2017

Migrating a datacenter with PowerCLI – Introduction

For the last few months, I have been working on a project to migrate 1000 virtual machines from one datacentre to another datacentre. Both datacentres are 50KM in distance from each other. The building where the source datacentre is situated, will be stripped and will be rebuild conform current standards.
This means that every window, door, wall and all cables will be removed.
You can imagine that moving all the physical hardware (3 blades chassis, 42u of storage hardware and physical switches) and virtual machine from one datacentre to another datacentre is a huge operation. Because the virtual machine hosted in this datacentre are running production workloads, user impact should be minimal, and if user impact is expected, and migrations should be done during maintenance windows.
Both datacentres have their own vCenter servers (6.0), multiple vSphere (6.0) clusters and storage (Fiber Channel), and are connected at L2 level. The vCenter servers are members of the same SSO domain.[expand title=”Read more…”]
Because of this, I can use long distance vMotion to move the virtual machines from one datacentre to the other datacentre.
Of course, this can be done, using the vSphere web Client, but because of the number of virtual machines, we decided to write a Powershell script, that will do the job for us.
This script is scheduled to run during maintenance hours, and will read text file (batchXX.txt) to determine which virtual machines should be migrated.

In this blog series, I will explain the PowerCLI script I created, step by step, and eventually, how the migration went.

Table of content
Introduction
Chapter 1: Log function
Chapter 2: Notifications
Chapter 3: Reading VM attributes
Chapter 4: Storage space
Chapter 5: Move-vm
Chapter 6: Testing
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