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  1. OpenShift Virtualization
  2. CNV-36684

[4.14] Cephfs to Block cloning is creating empty block device

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    • Resolution: Done-Errata
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    • CNV v4.14.3
    • CNV v4.14.0
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      Description of problem:

      Used below DV to clone a volume from cephfs to ceph-rbd storage class:

      apiVersion: cdi.kubevirt.io/v1beta1
kind: DataVolume
metadata:
  name: rhel8-imperial-sailfish-clone
spec:
  source:
    pvc:
      name: "rhel8-imperial-sailfish"
      storageClassName: ocs-external-storagecluster-cephfs
      namespace: nijin-cnv
  storage:
    resources:
      requests:
        storage: 33Gi
    storageClassName: ocs-external-storagecluster-ceph-rbd

       

      The cloning looks to be successful:

      I1221 15:46:44.535710       1 uploadserver.go:74] Running server on 0.0.0.0:8443
I1221 15:46:54.795381       1 uploadserver.go:389] Content type header is "filesystem-clone"
I1221 15:48:23.381155       1 uploadserver.go:416] Wrote data to /dev/cdi-block-volume
I1221 15:48:23.381241       1 uploadserver.go:203] Shutting down http server after successful upload
I1221 15:48:23.381665       1 uploadserver.go:103] UploadServer successfully exited

      But there is nothing in the cloned volume and it's all zeroes.

      sh-5.1$ dd if=/dev/disk-poised-goat bs=1M  |hexdump -C
00000000  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
33792+0 records in
33792+0 records out
35433480192 bytes (35 GB, 33 GiB) copied, 66.1271 s, 536 MB/s
840000000

      Version-Release number of selected component (if applicable):

      OpenShift Virtualization   4.14.1

      4.12 and 4.13 also don't work.

      How reproducible:

      100%

      Steps to Reproduce:

      1. Create a DV to clone from filesystem to block.
2. The cloned targed disk is empty.

      Actual results:

      Filesystem to Block cloning is creating empty block device

      Expected results:

      Data copy should work.

      Additional info:

       

              akalenyu Alex Kalenyuk
              rhn-support-nashok Nijin Ashok
              Dalia Frank Dalia Frank
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                Created:
                Updated:
                Resolved: