In Resource Monitor, under Disk > Disk Activity, a list of files is shown along with the disk read/write B/sec being performed on each. When memory is paged to disk (ie. virtual memory is written), is it reported as write activity against the pagefile.sys? When a hard fault occurs (ie. virtual memory is read), is it reported as read activity against pagefile.sys?
Background
We had performance problems with a large database. Resource monitor showed copious disk activity, mostly reads, against the mdf file and sqlservr process; two orders of magnitude greater than usual load. It did not appear to be due to any operation performed by our applications. Memory was also constrained at the time. I'm wondering if Resource Monitor reported virtual memory paging as Disk I/O on the db file and sqlservr process rather than on pagefile. A reboot and upsize of the VM brought disk I/O back to normal levels.