— Virtual and software defined stuff. And more! —

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Have you had a “fling” lately?

If you aren´t familiar with the flings from VMware Labs, now is the time to get to now them. Flings are a bunch of handy Tools, built by VMware engineers, that could make your life easier working with with virtual Environments.

Here´s a few of my personal favorites:

VCS to VCVA converter
A migration tool from Windows based vCenter servers to the Linux based virtual appliance.

ESXtopNGC Plugin
An enhanced plugin-version of ESXtop for the vCenter Web Client.

 PowerCLI Cmdlet for NFS

Check them all out at

Just keep in mind, they are provided “as is”, without any kind of support, so try them out in your test environments first.


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Drömmen om bästa lagringssystemet enligt IT-experten

Tintri_iconDet finns väl inget hörn av IT-miljön som är så teknikfixerat som lagringssystemet. Det är iops hit och antal spindlar dit, volymer här och LUNar där. Och hur är det nu på protokollfronten? Är NFS verkligen bättre än iSCSI eller är det FCP som gäller för riktigt stora pojkar? Och vilka diskhastigheter och storlekar gäller den här månaden?

Men hur ser då det perfekta lagringssystemet ut egentligen?

Läs hela artikeln här:

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Do NOT overprovision your virtual machines

It can never be said enough! Don´t overprovision your VMs. There, I said it again.
Overprovisioned VMs is probably the most common problem in vSphere Environments around the globe and, sadly, the business application industry still haven´t grasped this and continues to demand monster VMs in order to support their Products.

But there comes a time when you are forced to troubleshoot performance in your Environment, although your expensive, state of the art datacenter, was designed to run for years to come. Suddenly you´re running out of Resources in your cluster(s).

To prevent this form happening a few golden rules can come in handy.

Enable hot-add

Make sure you have enabled the hot-add feature for vCPU and vRAM on your VMs. This can only be done when the virtual machine is powered off but it´s better to Power it off once than every time you want to change Resources. Windows Server 2008 and newer supports both these features. See VMware kb 2051989 for a complete support matrix.

vRAM is better

Always try more vRAM Before adding extra vCPUs. Basically the same rule that has been used for many years now to speed up physical Windows computers.

Easy on the vCPUs

More vCPUs can improve perfomance but only up to a Point. The CPU Scheduler in your hypervisor has to Schedule the instructions from your vCPUs at the same time, More vCPUs makes it harder for your hypervisor to do this.


So how do I respond to my suppliers demands? The answer is, you don´t. Instead suggest a compromise that you start on a “reasonable” level and add more vCPUs and vRAM if and when it´s really needed.