63440: Acronis Cyber Protect Cloud, Acronis Cyber Backup: "Failed to obtain an instance of service class 'Msvm_VirtualSystemSettingData'" and "Failed to obtain an instance of service class 'Msvm_ComputerSystem'" errors

Last update: Fri, 2020-05-01 06:16

Symptoms

Backup of Hyper-V virtual machines fails or completes with these warnings:

Error code: 310
Module: 83
LineInfo: 0xFB98212D12086800
Fields: {"$module":"hv_srv_vsa64_8494"}
Message: Failed to obtain an instance of service class 'Msvm_VirtualSystemSettingData'.

or

Error code: 310
Module: 83
LineInfo: 0xFB98212D12086775
Fields: {"$module":"hv_srv_vsa64_8494"}
Message: Failed to obtain an instance of service class 'Msvm_ComputerSystem'.

or

Error 0x530016: Failed to find registered virtual machine '87A898FE-9749-4643-A47B-A69E24093218'.

Cause

VM was migrated across Hyper-V cluster to another host at an early stage of the backup process, before the virtual disks were opened for read access.

Solution

Avoid situations where VMs are migrated while the backup of them is running, for example by disabling automatic Live Migration ("Automatic Balancing of Virtual Machines") in Hyper-V cluster properties (Failover Cluster Manager) during the backup window.