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Using backup and replication v11 backup job of one vm in a Hyper-v cluster. I get the error 

2/18/2022 4:47:49 PM :: Failed to pre-process the job Error: Failed to call RPC function 'FcWriteFileEx': The requested resource is in use. Failed to flush file buffers. File: E:\Backups\Backup Job\Backup Job.vbm_1_tmp].  

 

Then this error

2/18/2022 4:47:50 PM :: Error: Failed to call RPC function 'FcWriteFileEx': The requested resource is in use. Failed to flush file buffers. File: eE:\Backups\Backup Job\Backup Job.vbm_1_tmp].  
 

Hi,

 

Something else is touching your file at the same time, most likely antivirus, make sure all AV products (even good old Windows Defender) are configured according to: https://www.veeam.com/kb1999

 

I can see the disk is being referenced by a local drive letter so it shouldn’t be any issues with accessing a network device, but if you have got a volume being presented with a local disk that is actually network storage (thinking iSCSI/FC storage) then you may be over-saturating the network and need to reduce task concurrency or cap the maximum MBps being written to the disk.

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