What does the ntpd drift file include?
Information about how the hardware clock drifts
Information about the stratum of the registered ntp servers.
Information about the time difference to GMT.
Information about the time polling frequency.
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s1-
Understanding_the_Drift_File.html
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