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From nathanejohnson <...@git.apache.org>
Subject [GitHub] cloudstack issue #1645: This converts the rbd raw format on disk to qcow2 fo...
Date Wed, 17 Aug 2016 21:20:27 GMT
Github user nathanejohnson commented on the issue:

    https://github.com/apache/cloudstack/pull/1645
  
    On KVM where primary storage is ceph / rbd, and a snapshot is backed up to secondary,
the comments seem to indicate that in this scenario the image will be converted to qcow2 to
save space.  In implementation, however, it actually "converts" the source format (RAW in
this case) into  RAW, which is effectly a straight copy.  This means that for a 20GB volume
that is mostly empty, it will copy a full 20GB file onto secondary storage as a backup.  I
have changed this to it always sets the source type to that of the disk (which should always
be RAW for RBD), and sets the dest disk type to QCOW2.


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