That's only cpu load. You also want to check it's I/O activity. (Solaris top also shows "I/O wait" percentages but Linux unfortunately does not.) On older Linux boxes "iostat 5" was the way to do that. Newer Linux systems may have different/better ways to do that.
That would probably be "vmstat 5". It gives you processes, memory, paging, block IO, traps, cpu activity. "vmstat -D" gives you disk stats. You can also use "netstat -tcs" to snapshot the number of established tcp connections on the machine - that might give you a true indication of the number of connections actually being served.
- Steve
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