NonStop NS-Series Planning Guide (H06.04+)

Modular System Hardware
HP Integrity NonStop NS-Series Planning Guide—529567-005
5-10
Logical Synchronization Unit (LSU)
Front Panel Buttons
Front Panel Indicator LEDs:
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 the current Integrity NonStop NS-
series 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 high 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
Button Function Condition Operation
Power Hard reset Power is on. Cycle power and reset or reconfigure logic.
Power in
standby.
Remain in standby.
TOC/NMI Soft reset Power is on. Send initialize interrupt to processors, but
without reset or reconfiguration of logic.
LED
Indicator State Meaning
Power Flashing green Power is on; NonStop Blade Element is available for normal
operation.
Flashing yellow NonStop Blade Element is in power mode.
Off Power is off.
Fault Steady amber Hardware or software fault exists.
Off NonStop Blade Element is available for normal operation.
Locator Flashing blue System locator is activated.