So I just started a new job and one of my tasks is to move our hosting to a new cheaper server, i'm trying to spec out the new server but I'm a little unsure on the amount of memory I will actually need.
Our current server has 4 gigs of RAM and when I use the top command to check out what's running it shows that 3 of the 4 gig is being used, but the system processes only show tasks using very small amounts of memory, the highest used is at 0.7.
first of all, is using 3 out of 4 gigs of RAM usual for a server that hosts less than 20 sites (most of which are fairly small scale) if not where has all my memory gone?
Some Server Info: OS: CentOS 5.5 RAM: 4gig CPU: Quad Core Intel Xeon (2GHz per core)