Thank you Ilya!
Tony
________________________________________
From: Ilya Dryomov <idryomov@xxxxxxxxx>
Sent: March 27, 2023 10:28 AM
To: Tony Liu
Cc: ceph-users@xxxxxxx; dev@xxxxxxx
Subject: Re: rbd cp vs. rbd clone + rbd flatten
On Wed, Mar 22, 2023 at 10:51 PM Tony Liu <tonyliu0592@xxxxxxxxxxx> wrote:
>
> Hi,
>
> I want
> 1) copy a snapshot to an image,
> 2) no need to copy snapshots,
> 3) no dependency after copy,
> 4) all same image format 2.
> In that case, is rbd cp the same as rbd clone + rbd flatten?
> I ran some tests, seems like it, but want to confirm, in case of missing anything.
Hi Tony,
Yes, at a high level it should be the same.
> Also, seems cp is a bit faster and flatten, is that true?
I can't think of anything that would make "rbd cp" faster. I would
actually expect it to be slower since "rbd cp" also attempts to sparsify
the destination image (see --sparse-size option), making it more space
efficient.
Thanks,
Ilya
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