Forum Discussion
Semaphore timeout when running a backup where source and destination is on the same Storage Space
RahulTK This week I have upgraded to Macrium Reflect 8 which enabled all the previous features like CBT and encryption and it still works like a charm.
This means the issues with the setup
2 HDDs with Storage Spaces Mirror where source vhdx and backup target (filebased) are stored on a ReFS volume with enabled Dedup gives no headaches.
From my trackings I'd say it has been fixed in b20313
RahulTK in the release Windows Server 2022 LTSC 20313 the issue disappeared but I would not mark it as solved. There have been a lot of changes and Unfortunately I didn't test enough after each change, sorry.
1. upgraded the VM (backup source) from 20H2 to 21H1
2. upgraded Server Hyper-V Host (and SMB Share holder to 20313)
3. upgraded from Macrium Reflect 7.3.x to 8.0 beta, this one has not the same feature set (CBT and backup file encryption are no longer in place)
4. I have disabled the scheduled jobs for automatic background optimization for Dedup and only run the base scheduled jobs. Reason for this was a problem i have seen in b20292
in https://techcommunity.microsoft.com/t5/windows-server-insiders/b20292-cpu-spikes-since-b20292-due-dedup/m-p/2147781
next steps:
I can provide you the logs via Onedrive
When MR 8.0 final is out I will try to enable the CBT and later encryption to see if one of these are causing the issue.
When this scenario has passed I will enable the background optimization again.
- I have enabled Background Optimization but this did not negatively affect anything.
II have reinstalled the server from Scratch because of this issue
https://techcommunity.microsoft.com/t5/windows-server-insiders/issue-b20251-b20257-b20262-b20270-b20282-b20287-formatting-a/
I will report back when MR 8 is released and I can leverage CBT and Encryption again, but in this case it seems to be more an application issue causing the overload / write latencies on the Storage Space to cause the semaphore timeout.
here are the logs from the session with Ned Pyle RahulTK
https://1drv.ms/u/s!ApTx3d3fhinPhLQQzXJ847miz7kMQw?e=ry73EiRahulTK This week I have upgraded to Macrium Reflect 8 which enabled all the previous features like CBT and encryption and it still works like a charm.
This means the issues with the setup
2 HDDs with Storage Spaces Mirror where source vhdx and backup target (filebased) are stored on a ReFS volume with enabled Dedup gives no headaches.
From my trackings I'd say it has been fixed in b20313