Creating Plans to Protect Data › How to Create a Host-Based Virtual Machine Backup Plan › Troubleshooting

Troubleshooting

Incremental Backup Converts to Verify Backup or the Backup Size Increases in Hyper-V

Valid on Hyper-V VM

Symptom

• I have performed an incremental change in a Hyper-V virtual machine. When I perform an incremental backup, the entire virtual machine is backed up instead of backing up only the changed data.
• I have a proxy server with Arcserve UDP Update 2 that backs up a virtual machine from one Hyper-V host (example HOST1). I have another proxy server with an older version of Arcserve UDP that backs up a virtual machine from the same Hyper-V host (HOST1). In such cases, the CBT is inactive and the Incremental jobs do not run. The Incremental backup converts to the Verify backup.

Solution

• The loss of change block tracking (CBT) data. The following circumstances will result in CBT data loss:
  • The Hyper-V host crashes or is powered off abnormally.
  • The CBT service is stopped or the service abnormally quits.
  • The CBT service did not complete its work while the Hyper-V host was shutting down.
• Different versions of CBT in the Hyper-V server and the proxy server.

  Example: Consider you have two Arcserve UDP environments, one is Arcserve UDP Version 5 and another is Arcserve UDP Version 5 Update 2. These two Arcserve UDP environments back up different VMs in the same Hyper-V server. The Arcserve UDP Version 5 Update 2 environment automatically detects the older version of CBT in the Hyper-V server and upgrades it to the latest version. In such cases, the Arcserve UDP Version 5 environment converts the remaining scheduled incremental backup to a full backup.

  If Arcserve UDP detects different CBT versions, the Activity Log displays a warning message.

• Upgrade all the proxy servers that protects virtual machines from one Hyper-V host to the same version of Arcserve UDP