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CHAPTER 6 Work after installation
6.2 NTP Configuration
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FIGURE 6.2 Operation Diagram when External NTP Server is used (When three NTP servers are used)
Only one NTP server can be specified. In that case, when it is not possible to communicate with the NTP server which is
specified by the NTP client, since other synchronous object does not exist, NTP server is disabled. NTP client cannot do
the time correction according to NTP within the period in which communication with the NTP server is restored. As a result,
time is recorded with the system clock accuracy. Since there is an individual difference in the accuracy of the system clock,
when time correction according to NTP is not possible, time gap between the systems is enlarged, and problems might be
caused in the middleware or in the application.
Remark
NTP server 1~NTP server 3 are the NTP servers having high accuracy of time in internet or in intranet.
6.2.2 Setting NTP server
Other NTP server which is time synchronous is specified by using the NTP client function of the MMB.
Note
Time of MMB and time of partition side is controlled by the respective independent clocks.
Clock of MMB does not repot
and adjust the partition clock. Since the time of MMB and time of partition, are necessary for following responses, keep the
MMB time and the partition time the same or at least close.
- At the time of comparing the MMB side log and the operating system side log in partition by the hard failure
- At the time of executing the system inspection or executing the security inspection