Comment 6 for bug 1054163

The cache is distributed across all compute nodes, though. Forcing it to be deleted from the cache would require broadcasting a message to all compute nodes every time an image is deleted, though. Is there a way for nova to know that an image has been deleted based on the metadata the admin user can see about that image?

On a related note, right now if the image is no longer in use (no instances running on that compute node that used it as their base), it will get deleted from the cache by a periodic task that runs every 40 to 60 minutes or so (40 ticks, so 40 * 60 seconds plus however long it takes for 40 runs of periodic tasks).