System Time Delay With Red Hat Enterprise Linux 5 (X86) - Hitachi Compute Blade 2000 User Manual

 How to deal with hardware failure
When hardware fails, the error LED on the system equipment turns on. Monitor the
error LED, and consult our maintenance personnel when you find the error LED
lights solid.
If the following message is displayed, hardware may fail. Check the error LED on the
system equipment.
Kernel panic - not syncing: NMI: Not continuing
System time delay with Red Hat
Enterprise Linux 5 (x86)
 Potential Problems and the Solution
Red Hat Enterprise Linux 5 (hereinafter referred to as RHEL5) may have the system
time delay (*1), even if rarely, by a few hours per day in operation. The system
continues to delay at the same rate from the boot to reboot. Even if you use the time
adjustment with NTP, the system time delays because the adjustment cannot work
properly.
Moreover, when this delay occurs, CPU clock frequencies that the OS recognizes
are higher than the actual clock frequencies.
This may seriously affect your business by not starting processes and batch jobs at
the scheduled time.
To avoid this problem, disable the item "Legacy USB Support" in the BIOS setting if
your system satisfies conditions described later in Conditions for Time Delay.
If this countermeasure cannot be applied, be sure to execute the procedures shown
in "How to Deal With the Time Delay". For how to apply the countermeasure and
how to deal with the time delay, refer to each item described later.
(*1) This system time delay cannot be automatically corrected.
 Conditions for time delay
When the following conditions are all satisfied, the system time may delay at a
specific timing.
1. OS is RHEL5 (x86).
AMD/Intel 64 architecture is not the case.
2. Item "Legacy USB Support" is Enabled in the BIOS setting.
3. Not in the LPAR manager environment.
This phenomenon can occur in all models that support RHEL5 (x86).
For condition 2, check the item "Legacy USB Support" in the BIOS setup menu. For
how to operate the BIOS setup menu, see Chapter 5 "Server Blade Setup".
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