Managing Time in a Clustered Environment
An essential aspect of managing cluster logs is verifying that timestamps for events on different nodes correspond. Internal server clocks can vary slightly over time due to differences in heat, environmental variables, electrical characteristics, and manufacturing variance within the chips. Over time, these slight differences between node clocks could lead to considerable variation. Any difference in timestamps makes synchronizing events between nodes difficult.
An administrator should not directly change the time on a running node using the date, rdate, or ntpdate (or similar) commands. Changing the time on a cluster node using these types of commands could induce errors.
Note
Confirm that no crontab(1) ...
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