Archive for March, 2012

Montreal VMUG – May 1st, 2012

I just wanted to announce that the Montreal VMUG is currently open for registration.  If you’re from the Montreal area or happen to just be in town, feel free to join us. All the details have been posted at

Categories: VMUG

Magic Quadrant for Blade Servers

Revised on March 20,  check out Gartner’s detailed report on blade technology and the major vendors’ pro and cons.

Figure 1. Magic Quadrant for Blade Servers

Categories: Whitepapers

Top 10 Myths About Virtualizing Business-Critical Applications

Some of the challenges I often face is trying to explain to (non-technical) application owners that virtualization technology has made many advancements in the last several years. They used to hear through the grape vine that VMs could not handle “heavy/critical” applications, or the vendor does not support virtualization (thanks Oracle sales team). Unfortunately this reputation stuck, and still to this day, some (uneducated) app owners still don’t feel comfortable virtualizing their applications. I spend a lot of my time proving that their assumptions are no longer valid. VMware released this little marketing gem that quickly summarizes the myths. Use this document to build your business cases when dealing with stubborn app owners!

Download it HERE

Online VMware Forum 2012: A Virtual Conference

VMware Forum 2012 Header

A Virtual Conference

Attend a Premiere Virtualization and Cloud Event without Leaving Your Office

Thursday, April 12, 2012
8 a.m. – 1 p.m. PT / 11 a.m. – 4 p.m. ET

Register Now

At this free, interactive online event, you will learn about transforming IT, so that you can transform your entire business to respond more effectively to markets, competitors and customers. Hear VMware, industry analysts and IT professionals discuss virtualization and cloud infrastructure solutions that enable your business to thrive in the cloud era.

This is your opportunity to:

  • Attend a live keynote presentation from the VMware leadership team
  • Network with your peers from the comfort of your own office
  • Chat with experts who will answer your questions live
  • Navigate in a 3D virtual environment with interactive booths staffed by VMware’s industry-leading partners
Categories: Uncategorized

TIL: You cannot use SCSI Bus sharing with thin provisioned VMDKs

Welcome to my first “today I learned” post. These are posts about details of which I didn’t know about and discovered. Sometimes simple, sometimes complex, but hopefully informative to others.

We have a test SQL 2005 cluster in our vSphere lab that used to power on properly until we did a storage vmotion and converted the VMDK disks to thin format. When trying to power up the VM vCenter spit the following error in the event logs and popped up an error window.

Cannot power Off: VMware ESX Server cannot open the virtual disk,
“/vmfs/volumes/4e60e9a1-f55ef4a3-405f-d485646713b8/MTL1TESQ01/MTL1TESQ01_6.vmdk” for
clustering. Please verify that the virtual disk was created using the ‘thick’ option. Cannot open the
disk ‘/vmfs/volumes/4e60e9a1-f55ef4a3-405f-d485646713b8/MTL1TESQ01/MTL1TESQ01_6.vmdk’
or one of the snapshot disks it depends on. Reason: Thin/TBZ disks cannot be opened in
multiwriter mode..

The resolution to this problem is obviously simple, you can either convert the disks to thick.  You can do it via the “inflate” option in the datastore browser or storage vmotion and select the thick option.

Also, if you don’t have any space left on any of your datastores to accommodate the thick disks and you really need to get one system up and running (degraded cluster), then you can always disable SCSI Bus sharing on the SCSI device and power up the VM.

vSphere 5 Deep Dive – Webcast (Wednesday, March 21, 2012)

Register here ->

On Wednesday, March 21, 2012. Please join this informative webcast as we take a deep dive into VMware vSphere 5. We will outline the major new features in vSphere 5, but more importantly we will take a deeper dive to explain why these changes matter and what impact they may have on your environment.

The presentation will be followed by a short Q & A session.

We hope to see you there!

Cool Tool: ESX System Analyzer (a fling from VMware Labs)

The ESX System Analyzer ( is a tool designed to help administrators plan a migration from ESX to ESXi. It analyzes the ESX hosts in your environment and, for each host, collects information on factors that pertain to the migration process:

  • Hardware compatibility with ESXi
  • VMs registered on the ESX host, as well as VMs located on the host’s local disk
  • Modifications to the Service Console
    • RPMs which have been added or removed
    • Files which have been added
    • Users and cronjobs which have been added

This tool also provides summary information for the whole existing environment

  • Version of VMware Tools and Virtual Hardware for all VMs
  • Version of Filesystem for all datastores

By having this information, administrators can determine what tasks need to be done prior to the migration. Examples include:

  • Relocate VMs from local datastores to shared datastores
  • Make note of what agent software has been added to the host and obtain the equivalent agentless version
  • Replace cronjobs with equivalent remote scripts written with PowerCLI or vCLI

Configuration is simple, just follow the user guide provided (

Once a report a run against your servers, you have access to several interesting reports. Personally I’ve used this tool when upgrading from ESX 3.5 to ESXi 4.1 and I will use it again soon when upgrading to vSphere 5.

by:  Riccardo Ventura (twitter: @hypervise)

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