Rtc Time Synchronization At N+M Cold Standby Failover - Hitachi Compute Blade 2000 User Manual

RTC time synchronization at N+M cold
standby failover
N+M cold standby has a function to take over RTC (Real Time Clock: BIOS time) to
the standby partition. Enabling this function allows the following OSs to co-exist in
the N+M group.

OS, except LPAR manager, which recognizes RTC as the local time
 OS that recognizes RTC as UTC (Universal Coordinate Time)
If this function is disabled, time difference may occur at
N+M failover. Thus, the configuration of mixed OSs in the
same N+M group is not supported. See Time Setting in
Switchover and Recovery with N+M Cold Standby in
Chapter 12 for details.
 Procedure for enabling RTC time synchronization
This subsection describes how to enable RTC time synchronization.
1. On the Time Setting screen of the management module, set the Time
Synchronization for Network Time Protocol (NTP) setting as Enable. See SD
Command or Time Setting in Chapter 6.
2. For the Time Synchronization Method on the BMC Time screen, select "Use the
NTP server of the Management Modules with RTC time handover on N+M cold
standby failover". See BMC Time in Chapter 5,
When enabling this function, make sure to check the time
of the management module and BMC before operation.
When N+M cold standby occurs with the incorrect time, the
correct RTC time is not taken over to the standby partition.
If the incorrect time is set, reset the time of the
management module and BMC. Time synchronization,
however, takes up to 15 minutes depending on your
configuration.
 Standby partition behavior in RTC time synchronization failure
If RTC time is not properly taken over to the standby partition due to hardware failure
when the function is enabled, you can select a standby partition behavior. See BMC
Time in Chapter 5 for BMC time settings,
 Continue boot (default)
RTC time on the active partition is not taken over to a standby partition. The
standby partition boots up with its own RTC.
 Suppressing boot
TRC time on the active partition is not taken over to a standby partition, and the
power to the standby partition is suppressed. Then, the standby partition is not
1541