On Sat, Mar 9, 2024 at 4:42 AM Nathan Morrison <natemorrison@xxxxxxxxx> wrote:
>
> 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
Hi Nathan,
This (stripe-unit == object-size and stripe-count == 1) is the default,
so if you want to change the object size, passing just --object-size is
sufficient.
Thanks,
Ilya
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