Adding Virtual Disks and “Operating System not found”

I ran into a frustrating issue the other day when attempting to add multiple new virtual disks to an existing VM. Upon doing so, I received the dreaded “Operating System not found” message when the VM was started. While the underlying issue was easy to discover, the way to fix the problem became tedious due to issues with the vSphere web client. This post contains some tips and tricks to make the process easier.

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Switching to the PVSCSI Controller

I recently was doing some performance tests and wanted to try out the VMware paravirtual SCSI controller (PVSCSI). The VM I was testing was running SUSE, had the LSI controller configured, and was running VMware tools on a vSphere 5.5 environment. Every time I tried to change to the PVSCSI controller the VM stopped working. For those of you thinking about using the PVSCSI, below are some tips that should assist.

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