===== [V7] ISSUE: Unable to generate delta using CBT. Reason=CBT log files do not match the number of virtual machine preferred owners (Hyper-V Cluster VM backup) ===== Article ID: 5338
Reviewed: 2018-05-04

Product Version:
AhsayOBM: Pre-7.15.4.10
OS: Windows ATTENTION 1st January, 2022: v7 officially End-of-Life [details] ===== Problem Description ===== When performing a Hyper-V cluster VM backup, the following warning message is displayed on the backup client interface, or in the backup report:
No. Type Timestamp Log
* ... ... ...
* info ... Start to collect CBT logs.
* warn YYYY/MM/DD hh:mm:ss Unable to generate delta using CBT., Reason = "The number of CBT log files do not match
the number of virtual machine's preferred owners." (ClusterStorage\Machine_Name\
VIRTUAL HARD DISKS\Machine_Name.VHDX)
* ... ... ...
===== Cause ===== This is a known issue with AhsayOBM version pre-7.15.4.10. ===== Resolution ===== To resolve the issue, patch the AhsayOBM application to version 7.15.4.10 or above.  The instructions can be found by Clicking Here. ===== Keywords ===== vm, virtual, machine, hyper-v, hyperv, hyper, cbt, cluster, generate, delta, preferred, owners