By default Nova deletes unused images in compute nodes after 24 hours. If you start an instance in which the image is no longer in the compute node, a transfer of the image from Glance is performed which increases the instance start up time. To override this, simply add the following line in the default section of nova.conf and restart the nova-compute service. The line will disable the removal of unused images from the compute nodes.
remove_unused_base_images = False
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