Ntp Client; Proactive Monitoring; Figure 4.5 Diagram Of Time Synchronization (Of Three 3 Ntp Servers) - Fujitsu PRIMEQUEST 2000 Series General Description Manual

CHAPTER 4 Functions provided by the PRIMEQUEST 2000 series

4.7 Proactive monitoring

The PCH-RTC is driven by the SB battery (*1), and the PCH-RTC stops when the SB battery is run out.
When the SB battery runs out, the BIOS reflects the time of the MMB in the PCH-RTC.
BMC
The RTC of the BMC synchronizes with the RTC of the MMB immediately after the mounting the SB and the
AC is turned on; if the AC is off, the RTC of the BMC need not be maintained.
Therefore the RTC of the BMC is not maintained by the SB battery. The MMB instructs BMC for
synchronization between BMC and MMB at regular intervals. The BMC that receives the instruction adjusts
the BMC time with the MMB time, thereby synchronizing the time. If the MMB time is modified manually, the
BMC time synchronizes with the MMB time.

4.6.2 NTP client

In PRIMEQUEST 2000 series, the MMB becomes an NTP client to synchronize the time with an external
NTP server.
When NTP servers in an external network are not connected to the PRIMEQUEST 2000 series, it is
recommended to use an NTP server device that uses an external clock. As shown in the following figure, the
MMB can access another NTP server and synchronize the time with the NTP server. For stable NTP
each NTP client should have several NTP servers (at least three for RHEL)
operation,
Notes
When using more than one NTP server, use them in the same stratum (layer).
Only one NTP server can be specified. In this case, if the communication with the specified NTP server is
disconnected, the NTP client loses the NTP server as there is no other target to synchronize. Until
communication with the NTP server is re-established, the NTP client cannot adjust the time through the NTP.
Therefore, if the time cannot be adjusted through the NTP, the time gap between the systems may increase,
which could lead to malfunction of the middleware or application.
4.7 Proactive monitoring
This section describes the Proactive monitoring of the PRIMEQUEST 2000 series.
Proactive monitoring and linkage with the operations management server are performed for any system
account.
The section describes the following.

FIGURE 4.5 Diagram of time synchronization (of three 3 NTP servers)

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