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  • Nikhil Verma

Horizon Instant Clones provisioning fails with the error: "Unable to prepare migration"

Updated: Aug 4, 2019

Sometimes we have face this issue while creating instant clone pool.

If you have already tried to set Esxi hosts in maintenance mode ,even set attribute instantclone.maintenance=2 but still you are facing same error.

This KB if you have already followed : https://kb.vmware.com/s/article/60397


Then try this workaround : Power off your parent template , go to edit settings => VM options => Advanced => edit configuration => remove any value against this attribute "namespaceMgr.db".


=> Power ON parent VM

=> Gracefully shutdown and take new snapshot.

=> Publish new snapshot in Instant clone pool

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