Timer Functions - Hitachi Compute Blade 2000 User Manual

Timer functions

 Timer function overview
The following figure shows how LPAR manager calculates time and relations among
timers.
Guest
Timer counter -> Lapse of time
Timer interrupt -> Lapse of time
LPAR
Timer counter
Interrupt timer
HVM
Timer counter ->
Lapse of time
Server blade
Timer counter
Chassis
Terms
RTC: Real Time Clock
SEL: System Event Log
U/L: UTC (Universal Coordinated Time)/Local time
*1 When UTC is adopted for LPAR timer, add the time zone.
*2 When SEL is created with SC/BSM during DST (daylight saving time), there is a DST
difference between the SEL time and OS system time.
*3 This route is used only when LPAR manager creates LPAR SEL.
*4 When NTP server is used, the system unit timer is updated.
OS system time (L)
+
(L/U）
OS boot time (L/U)
*1
・ ・・
+
LPAR timer (L/U) LPAR SEL timer (L)
(Logical RTC)
RTC
-
+ +
time
difference
LPAR manager system time (L)
+
*4
LPAR manager
boot time
System unit timer (L) SEL timer (L)
(Physical RTC)
SVP time (L)
SVP timer (L)
1327
+
*2
(L)
OS time zone
SEL time (L)
-
SEL
time
difference
+
LPAR SEL
time zone
*3
-
+
LPAR manager
time zone
+ +
BMC timer (L) BMC time zone
NTP
+ +
server
(U)
SVP time zone