Hitachi Compute Blade 2000 User Manual page 1085

LPAR manager manages some types of time shown in the following table. LPAR manager
creates each time using differentials between different times.
Based on the LPAR manager system time, LPAR manager creates the logical timer for
each LPAR. A guest OS on the LPAR manages "OS system time" using this logical timer.
LPAR manager manages the following time shown in the table below.
Time
System equipment A clock in the server blade running by the battery: shows a local time.
time (Physical
LPAR manager system time is based on this time.
RTC time)
LPAR manager Used for the LPAR manager screen display as the LPAR manager time.
system time
Added elapsed time calculated with the timer counter (TSC) to the physical
RTC time at the LPAR manager boot.
Logical RTC time Is the basis for the OS system time.
Calculated using the differentials from the LPAR manager system time.
OS system time Used as a guest OS time.
Added the elapsed time calculated using the logical timer counter, timer
interrupt, and the time zone to the logical RTC time at the OS boot.
SEL time Used as the timestamp of the logical SEL.
Calculated using the differentials from the LPAR manager system time.
The following table shows precision on timers and how to adjust time.
Item Time/
Timer
counter
System System
equipment equipment
time (physical
RTC time)
LPAR LPAR
manager manager
system time
(Timer
counter) (*5)
Description
Precision Time synchronization
sec./day
Before Save Time
Config is supported
± 4
・ EFI setup menu
・ Enable LPAR
manager system
time synchronization
・ LPAR manager boot
with system time
synchronization
enabled
TSC: ± 4
・ Enable LPAR
manager system
time synchronization.
Cpu
・ LPAR manager boot
Frequency:
with system time
± 1
synchronization
enabled
1034
After Save Time
Config is supported
・ EFI setup menu
・ Enable LPAR
manager system
time
synchronization.
・ LPAR manager
boot with system
time
synchronization
enabled.
・ Periodic time
synchronization
once every 24
hours
・ Date and Time
screen (*1)
・ Saving HVM
configuration
・ LPAR manager
shutdown
・ Enable LPAR
manager system
time
synchronization.
・ LPAR manager
boot with system
time
synchronization
enabled