Domain time may drift after an abrupt system down

Asset ID:	1-72-2238724.1
Update Date:	2017-03-23
Keywords:

Solution Type Problem Resolution Sure

Solution 2238724.1 : Domain time may drift after an abrupt system down

Applies to:

Fujitsu M10-1 - Version All Versions and later
Fujitsu M10-4 - Version All Versions and later
Fujitsu M10-4S - Version All Versions and later
Oracle Solaris on SPARC (64-bit)

Symptoms

After a power outage, domain time drifted back for 8 hours, more than NTP can handle. Applications were greatly impacted.

Changes

From console log, it's found domain time had been changed long before.

Cause

XSCF records the base time and the time difference to the domain time.
Upon power on, the domain is able to calculate the right time of its own, based on the XSCF time.

If the domain time is changed (such as being modified by command date), a normal domain reboot is required to adjust the time difference in the XSCF.

In this case, there had not been a normal reboot since the domain time experienced the big change.

After the unexpected power outage, the time difference was lost.

When the domain booted up, its time was set to be equal to the XSCF time, which had been 8 hours behind the domain time.

Solution

To prevent such a problem:

1. It's better to have the XSCF and the domain to keep the same time.

2. If the XSCF and the domain have different time setting, reboot the domain whenever changing the domain time.

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