My VMware blog

To help others as others have helped me

iSCSI

How to add a new VMFS Datastore via PowerCLI

I recently wanted to know how to add a new iSCSI LUN as a new VMFS datastore via the PowerCLI. After some initial research and searching the online PowerCLI help I figured out the steps needed to complete such a task. To add a new LUN as a new VMFS Datastore follow these instructions; Configure […]

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Unable to perform unclaim. Error message was : Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information

During my VACP5-DCA studies I was testing the commands required to mask a LUN from the host when I suddenly stumbled into the following error message. “Unable to perform unclaim. Error message was : Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information” The command that caused […]

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IOPS Calculator

Over the last few weeks I have needed to calculate the theoretical amount of IOPS a collection of disks can produce a few times and to help myself I created a spreadsheet with all the inputs I would need and this then produced a theoretical calculation of the amount of IOPS the disk collection could […]

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New Home Test Lab Help

I am currently in the market for a new test lab and as always I don’t want to spend a fortune. My budget for the lab is £600. I will be using the lab to help pass the VMware VCAP5-DCA and VCAP5-DCD exams so I will need the lab environment to study all elements of […]

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Unable to connect to host with vSphere Client or vCenter

Symptoms I had an issue today where I could not connect to one of my ESXi hosts via the vSphere Client or vCenter. I also noticed that when I logged on to the console it was very sluggish accessing the configuration menu (This might be a red herring). All my VMs were running and I […]

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