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.
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