We just put up a new Server 2016 Hyper-V host and moved roughly 10 VMs to it from several Server 2012 R2 Hosts.
We are running Veeam B&R and have had no issues until this point. We can not successfully create checkpoints manually, and Veeam backups are failing for this same reason.
Error messages and logs are below.
Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin Source: Microsoft-Windows-Hyper-V-VMMS Date: 4/18/2018 2:16:20 PM Event ID: 18014 Task Category: None Level: Error Keywords: User: SYSTEM Computer: Server Description: Checkpoint operation for 'VM' was cancelled. (Virtual machine ID 81998206-704D-4303-88D0-EE956C499142) Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Hyper-V-VMMS" Guid="{6066F867-ABC-4418-85FD-36E3F9C0600C}" /><EventID>18014</EventID><Version>0</Version><Level>2</Level><Task>0</Task><Opcode>0</Opcode><Keywords>0x8000000000000000</Keywords><TimeCreated SystemTime="2018-04-18T21:16:20.207168700Z" /><EventRecordID>1305</EventRecordID><Correlation /><Execution ProcessID="3676" ThreadID="12192" /><Channel>Microsoft-Windows-Hyper-V-VMMS-Admin</Channel><Computer>Server</Computer><Security UserID="S-1-5-18" /></System><UserData><VmlEventLog xmlns="http://www.microsoft.com/Windows/Virtualization/Events"><VmName>VM</VmName><VmId>81998206-704D-4303-88D0-EE956C499142</VmId></VmlEventLog></UserData></Event> Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin Source: Microsoft-Windows-Hyper-V-VMMS Date: 4/18/2018 2:16:20 PM Event ID: 18012 Task Category: None Level: Error Keywords: User: SYSTEM Computer: Server Description: Checkpoint operation for 'VM' failed. (Virtual machine ID 81998206-704D-4303-88D0-EE956C499142) Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Hyper-V-VMMS" Guid="{6066F867-7ABC-4418-85FD-36E3F9C0600C}" /><EventID>18012</EventID><Version>0</Version><Level>2</Level><Task>0</Task><Opcode>0</Opcode><Keywords>0x8000000000000000</Keywords><TimeCreated SystemTime="2018-04-18T21:16:20.207202300Z" /><EventRecordID>1306</EventRecordID><Correlation /><Execution ProcessID="3676" ThreadID="12192" /><Channel>Microsoft-Windows-Hyper-V-VMMS-Admin</Channel><Computer>Server</Computer><Security UserID="S-1-5-18" /></System><UserData><VmlEventLog xmlns="http://www.microsoft.com/Windows/Virtualization/Events"><VmName>VM</VmName><VmId>81998206-704D-4303-88D0-EE956C499142</VmId></VmlEventLog></UserData></Event> Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin Source: Microsoft-Windows-Hyper-V-VMMS Date: 4/18/2018 2:16:20 PM Event ID: 19100 Task Category: None Level: Error Keywords: User: SYSTEM Computer: Server Description: 'VM' background disk merge failed to complete: The process cannot access the file because it is being used by another process. (0x80070020). (Virtual machine ID 81998206-704D-4303-88D0-EE956C499142) Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Microsoft-Windows-Hyper-V-VMMS" Guid="{6066F867-7ABC-4418-85FD-36E3F9C0600C}" /><EventID>19100</EventID><Version>0</Version><Level>2</Level><Task>0</Task><Opcode>0</Opcode><Keywords>0x8000000000000000</Keywords><TimeCreated SystemTime="2018-04-18T21:16:20.232904700Z" /><EventRecordID>1308</EventRecordID><Correlation /><Execution ProcessID="3676" ThreadID="12192" /><Channel>Microsoft-Windows-Hyper-V-VMMS-Admin</Channel><Computer>Server</Computer><Security UserID="S-1-5-18" /></System><UserData><VmlEventLog xmlns="http://www.microsoft.com/Windows/Virtualization/Events"><VmName>VM</VmName><VmId>81998206-704D-4303-88D0-EE956C499142</VmId><ErrorMessage>%%2147942432</ErrorMessage><ErrorCode>0x80070020</ErrorCode></VmlEventLog></UserData></Event>
Brian Modlin