I have recently installed some server monitoring software on my web server which has the ability to send me various alerts. I can set the alert based on Cached, Shared, Buffers or Free but I have no idea which is most relevant. I'm guessing a combination of shared and buffers.
The server has 1.5GB ram and is hosting a website that is getting around 1000 visits a day but that is expected to increase steadily (or rapidly). In the last hour it has averaged
What should I be looking out for?