This was asked in reddit and was requested to post here: So in RBD, say I want to make an image that's got an object size of 1M instead of the default 4M (if it will be a VM say, and likely not have too many big files in it, just OS files mostly). I also know I don't wanna go too crazy and make 4k objects or the cluster will blow up with number of objects. What's a good rule of thumb on what to set the stripe unit and count in relation to object size? Also how can I see the stripe unit and count for an image, it seems "rbd info <img-name>" doesn't show it, only object size (or order). Would this be sensible (assuming old img is default 4M obj size) or really stupid and why? rbd cp --object-size 1M --stripe-unit 1M --stripe-count 1 pool/old-img pool/new-img I'm trying to get my head around striping and I tried using this page (https://docs.ceph.com/en/latest/dev/file-striping/) to understand what's going on low level, but it's just leaving me more confused the more I read it.