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07.01.2015 18:40:39 :: Error: Incorrect function. Failed to flush file buffers. File: [E:\Backup\BCK_Name_ALL\BCK_Name_ALL2015-01-07T113550.vbk].
As soon as the Backupfile (vbk) reaches a size about 2 TB+, this error occurs and the session stops. If I do a Retry the performance drops to around 5MB/s and at some point the retry also fails with nothing written to the vbk.
What components I can exclude so far are the storage, the network and the server performance.
I suspect it has something to do with the repository, its an Windowsserver Repository, an iSCSI-Storage with a 17TB LUN behind that.
Now the blocksize we used in NTFS is 64k, maybe this is the issue? Would 8k be the better blocksize?
And what about REFS, would a Volume formatted with REFS maybe prevent this failure (although the REFS min. blocksize is alos 64k)