I am curious about how RBD cache works, whether it caches and writes back entire objects. For example, if my VM images are stored with order 23 (8MB blocks), would a 64MB rbd cache only be able to cache 8 objects at a time? Or does it work at a more granular fashion? Also, when a sync/flush happens, would the entire 8MB block be written back to ceph, or maybe some offset writes happens?
Thanks.
-Simon
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