Currently, with delay_delete enabled, the Glance scrubber happily deletes whatever images you ask it to. That includes images that are currently in use by Nova guests, which can really hose things. It'd be nice to have an option to tell the scrubber to skip deletion of images that are currently in use, which is fairly trivial to check for and provides a nice measure of protection.
Without delay_delete enabled, checking for images in use likely takes too much time, so this would be limited to just images that are scrubbed with delay_delete. I wanted to bring this up here before I go to the trouble of writing a spec for it, particularly since it doesn't appear that glance currently talks to Nova as a client at all. Is this something that folks would be interested in having? Thanks! -- Chris St. Pierre
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