I have setup two identical x86_64 headless servers running Centos 6.3. When I access the servers via ssh, either through the local LAN or through the Internet, the session becomes unresponsive at random intervals, ranging from one or two seconds to >1 minute. Just to be clear, the sessions are not disconnecting, they just become completely unresponsive as in what I type in does not appear on screen during the lag (but does afterwards), and if running top the refresh stops. This happens equally in both servers. Other network services (httpd and nfs) appear to be unnafected during these blackouts. Disruption seems to increase while using the terminal, so it becomes impossible to operate the machine remotely after some time.
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