Table 2-6 LPAR manager Managing Times
Time
Description
System equipment
time (Physical RTC
time)
A clock in the server blade running by the battery: shows a local
time. LPAR manager system time is based on this time.
LPAR manager system
time
Used for the LPAR manager screen display as the LPAR manager
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.
Table 2-7 Timer Precision and Adjustment Method
Item
Time/Timer
counter
Precision
[sec./day]
Time synchronization
Before Save Time
Config is
supported
After Save Time
Config is
supported
System
equipment
System
equipment time
(physical RTC
time)
±4
- EFI setup menu
- Enable LPAR
manager system
time
synchronization
- LPAR manager
boot with system
time
synchronization
enabled
- 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 LPAR
manager
configuration
- LPAR manager
shutdown
LPAR
manager
LPAR manager
system time
TSC:
±4
- Enable LPAR
manager system
- Enable LPAR
manager system
2-12
System Operation
Hitachi Compute Blade 500 Series Logical partitioning manager User's Guide