I recently made some device changes and ran discovery.php -h all and poller.php -h all. Shortly after that I noticed that on one Windows 7 Pro box I'm monitoring, I no longer have any physical memory in the memory graph, just virtual memory. The entire history of it disappeared, and it hasn't started new or anything like that.

I checked permissions on that workstation's rrd directory, and all looks good. I do have some backups of the rrd directories. Should I restore?