Friday, May 13, 2011

Cannot add existing disks to my guest

Since I migrated my VMWARE environment to vSphere 4.1 Virtual Center, I started getting a few errors when adding existing disks to virtual machines.

The error says:
Adding existing IDE disk is not supported at the moment. IDE disks cannot be hot added or there are no free available IDE controller slots.

I realized that disk are old disks that are on my environment since older versions of virtual center and VMDK descriptor file contains a legacyesx value instead of the lsilogic value of current ESX versions.

Seems this parameter is not compatible with vSphere 4.1 anymore.
So, you need to edit the VMDK description file and replace

ddb.adapterType = legacyESX
ddb.adapterType = lsilogic

After that the disk could be attached to the virtual machine without any problem.
Check VMWARE KB 1025883 for more details

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I’m an IT specialist with over 15 years of experience, working from IT infrastructure to management products, troubleshooting and project management skills from medium to large environments. Nowadays I'm working for VMware as a Consulting Architect, helping customers to embrace the Cloud Era and make them successfully on their journey. Despite the fact I'm a VMware employee these postings reflect my own opinion and do not represents VMware's position, strategies or opinions. Reach me at @dumeirell

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