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KVM NFS template image

Greetings All,

For qcow2 format images, when creating a new VM in KVM, the template image is copied from secondary storage to primary storage, and the root volume image is created with the template image as a backing file.

But when I break this backing chain on primary(expunge VM or revert to a snapshot previously created on the root volume image), the template image is not deleted.

Might I ask how is the template image going to be cleaned from the primary storage?

CS ver 4.9.2 on CentOS 7.2