KB ID : 115079
Published : July 12, 2018
Created : July 12, 2018
Last Modified : July 12, 2018

IMAGE INTEGRITY CHECK

The image Integrity check is a backup verification process in Vembu BDR where the integrity of the backed up data will be periodically auto-verified. This verification is carried out by booting VMs via Hyper-V manager in Windows and KVM manager in Linux OSes and taking the snapshot of login page of backed up VMs. This can be found in the integrity reports section under the BDR server.

Requirements for image integrity report:

  • Hyper-V role should be installed and enabled in BDR Server running Windows machine.
  • KVM should be installed in BDR server running Linux machine.
  • Free RAM size should be 1 GB or more to boot the VM (If less, the boot process will be skipped).

Supported Schedule type:

  • Image integrity check is supported for 'Run Every' and 'Run Daily' schedule types.

Image integrity check is not supported in the following cases:

  • For 'Run Weekly' schedule type.
  • If the backup is suspended for a long time period(no schedules were run).
  • For Non-OS disks, only mount test can be performed and boot test will be tagged NA.
  • For Ubuntu VMs with disk size more than 2TB, boot check is not supported in Hyper-V manager.
  • Mount check is not supported in KVM manager.
  • For GPT partitioned VM, boot check is not supported in KVM manager.

Process:

1) A newly configured backup job will undergo its first integrity check after 24 hours from its full backup's successful completion time. A backup schedule post-24-hour cycle is required, to initiate first integrity check.

2) After the 24-hour cycle, only after a backup schedule is performed.

3) Successive integrity checks will be performed at a 24-hour cycle which begins at the successful completion time of last integrity check.

4) Also, note that integrity check will be performed for last known successful backup.

Example:

1) A backup configured at 9 AM today(Monday) and its full backup completes at 9:10 AM.

2) Integrity check will be performed the next day(Tuesday) after 9.10AM(when first backup schedule post 9:10 AM completes, first integrity check will be performed).

3) The first integrity check completes at 9:40 AM (Tuesday), as per 24-hour cycle the next integrity check will be performed on or after 9:40 AM (Wednesday).

4) This cycle repeats at 24-cycle every day with integrity check completion time set as the beginning of the cycle.

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