NonStop NS14000 Planning Guide (H06.10+)

Front Panel Buttons
OperationConditionFunctionButton
Cycle power and reset or
reconfigure logic.
Power is on.Hard resetPower
Remain in standby.Power is in standby.
Send initialize interrupt to
processors, but without
reset or reconfiguration of
logic.
Power is on.Soft resetTOC/NMI
Front Panel Indicator LEDs
MeaningStateLED Indicator
Power is on; NonStop Blade Element
is available for normal operation.
Flashing greenPower
NonStop Blade Element is in power
mode.
Flashing yellow
Power is off.Off
Hardware or software fault exists.Steady amberFault
NonStop Blade Element is available
for normal operation.
Off
System locator is activated.Flashing blueLocator
Logical Synchronization Unit (LSU)
The LSU is the heart of both the high-availability duplex NonStop Blade Complex and the
fault-tolerant triplex NonStop Blade Complex. In Integrity NonStop NS14000 systems, each LSU
is associated with only one logical processor.
The LSU is the gateway to the ServerNet fabrics for the duplex or triplex NonStop Blade
Complexes. It ensures that I/O from logical processors is valid before allowing it into the ServerNet
fabric. The LSU module compares I/O streams between the output of each NonStop Blade Element
to ensure validity of the data. No data leaves the confines of a single NonStop Blade Element
without being compared to and validated with the data from the other NonStop Blade Element
(duplex processor) or the other two NonStop Blade Elements (triplex processor).
The LSU enclosure, which is 4U and weighs 96 pounds (43.5 kilograms) when fully populated,
has these physical attributes:
• Rackmountable
• Redundant AC power feeds
• Front to rear cooling
• Connections for three NonStop Blade Elements
• Connections for two ServerNet fabrics
• Cable management and connectivity on the rear of the cabinet
Logically the LSU:
• Implements a fault domain that affects only a single logical processor
• Has environmental sense and control (ESC) aspects managed by the logical processor
• Supports single-point system power-on
58 Modular System Hardware