Configuring Ntp; How Ntp Operates In The Primequest 1000 Series; Figure 7.2 Operation With External Ntp Servers (Three Ntp Servers) - Fujitsu PRIMEQUEST 1000 Series Installation Manual

PRIMEQUEST 1000 Series Installation Manual
CHAPTER 7 Work after Installation
7.2

Configuring NTP

This section describes how to correct the time with NTP (Network Time Protocol) in the PRIMEQUEST 1000
series.
NTP is a protocol for exchanging time information between computers. The time correction function references
the correct time on another system at system startup. Then, it sets the time and keeps it within the specified error
range.
A system with the correct source time is called an NTP server. A system that references that server is called an
NTP client. The NTP server must be running NTP Service to respond to requests from the NTP client.
For details on time correction using NTP when the operating system is Windows, see
NTP Server (Windows).
Note
- Be sure to use the NTP when using a reserved SB.
For details on the notes on the use of reserved SBs, see Notes on Reserved SB function in 3.2.1 Reserved
SB in the PRIMEQUEST 1000 Series Administration Manual (C122-E108EN).
- A partition configured with more than one SB (2 or more SBs) must use NTP.
- If an SB failure causes SB degradation and the Home SB is replaced, the operating system reads the RTC
value of the new Home SB. This may result in a difference between the times before and after the Home SB
replacement.
All screenshots are display examples, and the actually displayed contents vary depending on the system
configuration and other factors.
7.2.1

How NTP operates in the PRIMEQUEST 1000 series

This section describes how NTP is used to correct the time of each partition in the PRIMEQUEST 1000 series.
The time is set at the following two types of units in the PRIMEQUEST 1000 series server:
- MMB
- Each partition
For details on how to set the MMB as an NTP client, see
The NTP client of the installed operating system corrects the time of each partition.
For stable NTP operation, specify multiple NTP servers (at least three servers in RHEL5) from each NTP client.

FIGURE 7.2 Operation with external NTP servers (three NTP servers)

NTP servers other than the MMB.
Note:
When using two or more NTP servers, match the stratum (layer) of the servers.
7.2.2 Setting an NTP server.
shows a diagram outlining operation with
207
APPENDIX F Setting up the
C122-E107-09EN