We have a windows 2000 sp4 server which freezes up for about 1 minutes while its web-app does a ~500mb write operation.
I can see the webapp start to do I/O activity (through process explorer) then the RDP session becomes unresponsive, you can click on windows and buttons but nothing happens. When the disk write finally finishes the session 'catches up' on all the mouse clicks you did during the freeze in a mad flurry of window activity and the server returns to normal. During the freeze the web-app stops as well.
The same behaviour happens on the console of the server. (so I know its not a network thing)
Nothing appears in the Event logs. Its like nothing happened. I have upgraded all the HP hardware drivers to the latest proliant support pack. And also run a HP hardware diagnostics which found nothing wrong.
What would cause a disk write to lock the rest of the OS?