Back story: Me and a small group of friends are playing an FTB Mindcrack server which started out on my local machine before we set up a dedicated server running a Xeon 2.8ghz processor and 4GB of ECC ram. I never had a single issue running and playing on the server on my local machine until the server started getting large enough I was starting to suffer performance loss so we switched to the server.
4GB ecc ram
Running MineOS on ESX with 3/4GB ram allocated
Minecraft version: FTB Mindcrack pack with MCPC legacy with World edit and dynmap plugins
Problem: Ever since the mindcrack got going on the new server computer there have been numerous crashes and even just being kicked while the server seems to do a ram dump and starts back up. Not to mention the lag spikes are shocking. I have just watched a lag spike closely on the web-ui and noticed the load averages shoot up and the free ram drop from 1GB to less than 100MB and the server itself idles around 1.6GB out of 2.5GB allocated.
What can I do to try and diagnose what’s happening and sort out these lag spikes/kicking and crashes?