There are different clocks and thus different times on an SE server:
The BS2000 system time based on the TODR (Time of Day Register);
On SU /390 the TODR is an autonomous clock.
On SU x86 the TODR is emulated by X2000.The time of the service processor (SVP time), which can be determined by BS2000 using the “Store Real Clock” command.
On SU /390 the SVP clock is an autonomous clock, which is synchronized by the Management Unit with its own time.
On SU x86 it is emulated by X2000 and supplied with the carrier system time.The time of the Management Unit.
The Management Unit can be synchronized with external timers.The time of the carrier system on SU x86, which is synchronized with the time of the Management Unit via NTP.
This is emulated by X2000 as the SVP time.
Furthermore, BS2000 can be integrated in a computer network in which the time of the participating systems is synchronized.
This chapter explains these interactions. It provides an overview of the administration of the system time in BS2000 and describes the initialization and synchronization of the system time as well as the summer time/winter time changeover and special cases.
For information on determining the time on system initialization see "Determining the time on system initialization".