23 Mar
2023
23 Mar
'23
3:20 a.m.
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.
Also, seems cp is a bit faster and flatten, is that true?
Thanks!
Tony
27 Mar
27 Mar
10:58 p.m.
New subject: [ceph-users] rbd cp vs. rbd clone + rbd flatten
On Wed, Mar 22, 2023 at 10:51 PM Tony Liu <tonyliu0592(a)hotmail.com> 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
28 Mar
28 Mar
3:45 a.m.
New subject: [ceph-users] rbd cp vs. rbd clone + rbd flatten
Thank you Ilya!
Tony
________________________________________
From: Ilya Dryomov <idryomov(a)gmail.com>
Sent: March 27, 2023 10:28 AM
To: Tony Liu
Cc: ceph-users(a)ceph.io; dev(a)ceph.io
Subject: Re: [ceph-users] rbd cp vs. rbd clone + rbd flatten
On Wed, Mar 22, 2023 at 10:51 PM Tony Liu <tonyliu0592(a)hotmail.com> 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
396
days inactive
401
days old
2 comments
2 participants
participants (2)
-
Ilya Dryomov -
Tony Liu