CentOS Server Management Help

512 mb ? Dont see how that can be. The display says 916144 k.

With no swap file the server is going to struggle to work when it gets busy, and either grind to a halt, or just crash.
Its a Media Temple base (dv) with 20 GB space, 512 dedicated RAM, and 1 TB bandwidth.
 
When it next jumps to a high load login and run

vmstat 2

leave running for a minute and then paste the output here, I do not believe swap is going to help as you have 1/2 your memory free so it's not constrained. I suspect high file io (waits) causing blocking...
 
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