A few days ago some weird behavior started to appear on some of our Virtual Machines hosted by Hyper-V
At some stage some issues started to occur. Complain 'file or directory not exists' for the files that 100% exist.
When I ran chksdk it responded
The type of the filesystem is RAW.
CHKDSK is not available for RAW drives.
But after rebooted the VM chkdsk worked and showed filesystem as NTFS again.
But the issue reoccurred again and again.
I recovered VM from the 100% working backup (a few months old) but the issue persisted.
This cannot be a VM issue because backup is created a few months before the issue occurred first time.
Is that something wrong with the Hyper-V server itself?
