Hi,
I can't comment on why #3 shouldn't be used, but a quick test shows
that the image is not really usable in that case. I created a
partition on the src-image (1 GB), filled it up with around 500 MB of
data and then did the same export you did:
rbd export --export-format 2 src-image - | rbd import - dst-image
dst-image has around 500 MB total size and does not have a partition,
so it's broken. Apparently, if you use "--export-format 2" to export
you should also use the same flag for import. But the result is the
same if you omit the flag for both export and import.
I'm not sure if that should be documented, one could argue that you
should use the same flags if you want to use the dest-image the same
way as the src-image. You could create a tracker issue in the category
"documentation" and see what Zac thinks of it (added him in CC):
https://tracker.ceph.com/projects/ceph
Zitat von Tony Liu <tonyliu0592@xxxxxxxxxxx>:
Hi,
src-image is 1GB (provisioned size). I did the following 3 tests.
1. rbd export src-image - | rbd import - dst-image
2. rbd export --export-format 2 src-image - | rbd import
--export-format 2 - dst-image
3. rbd export --export-format 2 src-image - | rbd import - dst-image
With #1 and #2, dst-image size (rbd info) is the same as src-image,
which is expected.
With #3, dst-image size (rbd info) is close to used size (rbd du),
not the provisioned
size of src-image. I'm not sure if this image is actually useable
when write into it.
The questions is that, is #3 not supposed to be used at all?
I checked doc, didn't see something like "--export-format 2 has to
be used for
importing the image which is exported with --export-format 2 option".
Any comments?
Thanks!
Tony
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