02-27-2017
NTPD service restart and time synch
I am using ntpd service to sync our RHEL 5.9 system to synch with GPS clock.
When I change the RHEL system time more than 7 seconds than the present system time (through "Datetime" command), ntpd service does not adjust the system time to the present GPS time.But if the time is with in 7 seconds, the system time is correctly adjusted after we change the system time manually by "datetime" command.
7 second is specified in our drift file. Once I restarts the ntpd service manually, the time is again adjusted with the present GPS time. I have read many article in google and my understanding from the articles are as follows.
The ntpd service adjusts the drift (drift is specified in drift file).It assumes that systeem clock should be always synched with the GPS clock (reliable time source) unless and until ntpd
malfunctions. Can any one tell how ntpd works in comparison with W32tm service in window system?
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NTPTRACE(8) BSD System Manager's Manual NTPTRACE(8)
NAME
ntptrace -- trace a chain of NTP servers back to the primary source
SYNOPSIS
ntptrace [-vdn] [-r retries] [-t timeout] [server]
DESCRIPTION
The ntptrace utility determines where a given Network Time Protocol (NTP) server gets its time from, and follows the chain of NTP servers
back to their master time source. If given no arguments, it starts with ``localhost''.
Here is an example of the output from ntptrace:
% ntptrace
localhost: stratum 4, offset 0.0019529, synch distance 0.144135
server2ozo.com: stratum 2, offset 0.0124263, synch distance 0.115784
usndh.edu: stratum 1, offset 0.0019298, synch distance 0.011993, refid 'WWVB'
On each line, the fields are (left to right): the host name, the host stratum, the time offset between that host and the local host (as mea-
sured by ntptrace; this is why it is not always zero for ``localhost''), the host synchronization distance, and (only for stratum-1 servers)
the reference clock ID. All times are given in seconds. Note that the stratum is the server hop count to the primary source, while the syn-
chronization distance is the estimated error relative to the primary source. These terms are precisely defined in RFC 1305.
The following options are available:
-d Turn on some debugging output.
-n Turn off the printing of host names; instead, host IP addresses are given. This may be necessary if a nameserver is down.
-r retries
Set the number of retransmission attempts for each host; the default is 5.
-t timeout
Set the retransmission timeout (in seconds); the default is 2.
-v Print verbose information about the NTP servers.
SEE ALSO
ntpd(8), ntpdc(8)
D L Mills, Network Time Protocol (Version 3), RFC1305.
BUGS
This program makes no attempt to improve accuracy by doing multiple samples.
BSD
January 6, 2000 BSD