NonStop NS-Series Planning Guide (H06.05+)

Integrity NonStop NS16000 System Description
HP Integrity NonStop NS-Series Planning Guide—529567-008
4-3
NonStop Blade Complex
All input and output to and from each NonStop Blade Element goes through a logical
synchronization unit (LSU). The LSU interfaces with the ServerNet fabrics and contains
logic that compares all output operations of the PEs in a logical processor, ensuring
that all NonStop Blade Elements agree on the result before the data is passed to the
ServerNet fabrics.
A processor with two NonStop Blade Elements (NSBEs) and their associated LSUs
make up the dual modular redundant (DMR) NonStop Blade Complex, which is also
referred to as a duplex processor. This duplex processor provides data integrity and
system availability that is comparable to NonStop S-series systems, but at
considerably faster processing speeds.
Three NonStop Blade Elements plus their associated LSUs make up the triple modular
redundant (TMR) NonStop Blade Complex, which is referred to as a triplex system.
The triplex processor provides the same processing speeds as the duplex processor
while also enabling hardware fault recovery that is transparent to all but the lowest
level of the NonStop operating system (OS).
This diagram provides an overview of the modular NSAA and shows one NonStop
Blade Complex with four processors, the I/O hardware and the ServerNet fabrics.
NSBE B
NSBE A
NSBE C
VST727.vsd
Logical
Processor
0
Logical
Processor
1
Logical
Processor
2
Logical
Processor
3
PE
0
PE
0
PE
0
PE
1
PE
1
PE
1
PE
2
PE
2
PE
2
PE
3
PE
3
PE
3
LSU
0
X ServerNet
Switching
External
I/O
Modular
I/O
S-Series
I/O
Y ServerNet
Switching
Modular
I/O
S-Series
I/O
LSU
2
LSU
3
LSU
1
LSU
External
I/O
External
I/O
External
I/O