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[NFX] How to check integrity of QCOW2 file for VNF

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Article ID: KB34345 KB Last Updated: 23 May 2019Version: 1.0
Summary:

Is there a way to check to ensure QCOW2 or ISO file is not corrupted, as a result of a power failure?

Symptoms:

Had a power failure at the site, and want to ensure the QCOW2 or ISO files for the Virtual-Network-Functions (VNF) is proper, and in good integrity.

Solution:
  1. To check the file integrity of QCOW2 files for your VNF, you will need to go into hypervisor.

  2. Once in hypervisor, use the following command to check for file integrity:

    qemu-img info <path to qcow2 file>
    qemu-img check <path to qcow2 file>

  3. If there are no errors after running these commands, the file integrity is intact.


Example:

jdm:/var/third-party# ssh hypervisor
Last login: Mon May  6 17:34:51 2019 from jdm

root@localhost:~# qemu-img info /var/third-party/media-vsrx-vmdisk-15.1X49-D100.6.qcow2
image: /var/third-party/media-vsrx-vmdisk-15.1X49-D100.6.qcow2
file format: qcow2
virtual size: 16G (17179869184 bytes)
disk size: 3.3G
cluster_size: 65536
Format specific information:
    compat: 0.10
    refcount bits: 16
root@localhost:~#
root@localhost:~# qemu-img check /var/third-party/media-vsrx-vmdisk-15.1X49-D100.6.qcow2
No errors were found on the image.
53726/262144 = 20.49% allocated, 0.53% fragmented, 0.00% compressed clusters
Image end offset: 3522953216
root@localhost:~#
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