Fujitsu M10-1/M10-4/M10-4S: Should RTC Be Used As NTP Fallback Time Source?

Asset ID:	1-71-1906045.1
Update Date:	2018-05-17
Keywords:

Solution Type Technical Instruction Sure

Solution 1906045.1 : Fujitsu M10-1/M10-4/M10-4S: Should RTC Be Used As NTP Fallback Time Source?

Applies to:

Fujitsu M10-1 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4 - Version All Versions to All Versions [Release All Releases]
Fujitsu M10-4S - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Goal

This document handles the question of "Can the server's RTC clock on the XSCF be used as a reliable time source if the NTP servers becomes unavailable".

Solution

Per Fujitsu M10/SPARC M10 Systems -> System Operation and Administration Guide it is possible to use the XSCF as a NTP server:

From System Operation and Administration Guide, Page 105, Chapter: 3.6.8 Specifying the XSCF as an NTP server

A logical domain can be configured as an NTP client of the XSCF that is acting as an NTP server.
In this case, after the initial time of the logical domain is set based on the XSCF time, it is synchronized with the NTP server (XSCF).

The XSCF itself may be configured to synchronize its time with an external NTP Server. Thus, while technically possible, the RTC should not be used as a permanent fallback NTP Server in case that the external NTP Servers should be unavailable. It will nonetheless cover a temporary outage of all the NTP Servers.

Hint: In order to access the System Operation and Administration Guide, please go to the Fujitsu M10 Series Server Documentation.

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