Ceph » rbd

When using certain QCOW2 images as the source format for live migration, I encounter errors. With some QCOW2 images, the live migration is successful and with some it fails. Perhaps this has something to do with QCOW2 features that are not supported by live migration, but I haven't been able to identify a pattern.

To reproduce:

1. wget https://download.cirros-cloud.net/0.4.0/cirros-0.4.0-x86_64-disk.img

1. qemu-img info cirros-0.4.0-x86_64-disk.img

image: cirros-0.4.0-x86_64-disk.img

file format: qcow2

virtual size: 44 MiB (46137344 bytes)

disk size: 12.1 MiB

cluster_size: 65536

Format specific information:

    compat: 1.1

    lazy refcounts: false

    refcount bits: 16

    corrupt: false

1. cat source-qcow2.json {
   "type": "qcow",
   "stream": {
   "file_path":"/mnt/disk2/ceph/build/qcow2/cirros-0.4.0-x86_64-disk.img",
   "type":"file"}
   }

1. rbd migration prepare --import-only --source-spec "`cat source-qcow2.json`" rbd/testing
2. rbd migration execute rbd/testing
   ...
   2022-11-29T08:14:31.048+0000 7f76c67fc700 -1 librbd::deep_copy::ObjectCopyRequest: 0x7f76a40624e0 handle_read: failed to read from source object: (22) Invalid argument
   2022-11-29T08:14:31.048+0000 7f76c67fc700 -1 librbd::io::CopyupRequest: 0x7f76a4062720 handle_deep_copy: rbd_data.218d26fd56497.000000000000000a error encountered during deep-copy: (22) Invalid argument
   2022-11-29T08:14:31.048+0000 7f76c67fc700 -1 librbd::io::ObjectRequest: 0x7f76a8013350 handle_copyup: rbd_data.218d26fd56497.000000000000000a failed to copyup object: (22) Invalid argument
   2022-11-29T08:14:31.048+0000 7f76c67fc700 -1 librbd::MigrateRequest: 0x7f76b8026420 handle_migrate_objects: failed to migrate objects: (22) Invalid argument
   2022-11-29T08:14:31.048+0000 7f76c67fc700 -1 librbd::MigrateRequest: 0x7f76b8026420 should_complete: encountered error: (22) Invalid argument