Hi there,

we are using ceph hammer and we have some fully provisioned
images with only little data.

rbd export of a 500 GB rbd Image takes long time although there are only
15 GB of used data, even if the rbd-image is trimmed.

Do you think it is a good idea to enable the object-map feature on
already existing rbd images ?

I am thinking about using the rbd binary from ceph-master to change
the features of some existing rbd images like this:

rbd --image-feature exclusive-lock
rbd --image-feature object-map

Do you think this is a good idea, this will work and will be stable ?

Thanks
  Christoph
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