Hello,
Going through the documentation I am aware that I should be using RAW
images instead of Qcow2 when storing my images in ceph.
I have carried a small test to understand how this is going.
[root@ ~]# qemu-img create -f qcow2 test.qcow2 100G
Formatting 'test.qcow2', fmt=qcow2 size=107374182400 encryption=off
cluster_size=65536 lazy_refcounts=off
[root@ ~]# qemu-img info test.qcow2
image: test.qcow2
file format: qcow2
virtual size: 100G (107374182400 bytes)
disk size: 196K
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
After that i havce imported the image to my ceph cluster:
[root@ ~]# rbd import test.qcow2 --pool openstack_images
rbd: --pool is deprecated for import, use --dest-pool
Importing image: 100% complete...done.
Now, watching the size of the image and it's information :
[root@ ~]# rbd info openstack_images/test.qcow2
rbd image 'test.qcow2':
size 194 kB in 1 objects
order 22 (4096 kB objects)
block_name_prefix: rbd_data.123ca2ae8944a
format: 2
features: layering, exclusive-lock, object-map, fast-diff,
deep-flatten
flags:
So, what does this exactly mean ? am i able to store qcow2 ? Is it safe to
store qcow2? in the backend, how did that happen , were the image converted
somehow to raw ? have the other part of the image that did not have any
information stored trimmed ?
Thank you
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