Hello, To be exact, this matter doesn't seem to be ACS-related, it's rather VirtIO-related, though I'd like to post this message just to see if anyone else faced the same.
There were 3 or 4 times when I encountered the following glitch glitch: a guest operating system (it happened only to Windows Server guests, I never saw it with Linux guest) "decides" that its primary disk storage has more size than it actually is. For example, an instance had a virtual drive of 200 GB, it had been worked fine for years, but at some moment (no one knows at which exactly one) primary partition (we mean "drive C:", which usually is the 2nd one, as the 1st one is being used by the operating system) became the size of ~210 GB just out of the blue. After that, the system event log started growing with the following error messages: `The driver detected a controller error \ Device \ Harddisk0 \ DR`. Perhaps, it happens when the operating system tries to write pieces of data to the sectors that don't exist. Once I expand this virtual drive to 210 GB, the error messages don't appear anymore. Still, after that I find some part of the data corrupted (maybe some fragments of files are being stored to the non-existent sectors), so it seems to be a real problem when it happens. Alas, I didn't find a way to reproduce that. As I stated before, it's happened only 3-4 times (the first occurrence was ~2 years ago) in the environment of >1000 VMs, so the glitch is rare, though each time the outcomes are quite unpleasant. :-/ Just curious, did anyone saw something similar? Thanks in advance for any comments.
