NonStop Operations Guide for H-Series and J-Series RVUs

DescriptionTermSystems and Planning Guides
NonStop NS14000 series systems
their associated LSUs. A system includes up to
four Blade Complexes.
(2 to 8 processors per system)
Consists of a chassis, processor board
containing two or four PEs (one representing
Blade Element
NonStop NS14000 Series Planning
Guide
each logical processor in the Blade Complex),
memory, I/O interface board, midplane, optics
adapters, fans, and power supplies. Blade
Elements are mounted in a 19-inch computer
equipment rack.
A single Itanium microprocessor with its
associated memory. A PE is capable of
Processor element (PE)
executing an individual instruction stream and
I/O communication through fiber-optic links.
One PE from each Blade Element executing a
single instruction stream. A duplex system has
Logical processor
two PEs forming a logical processor. A triplex
system has three PEs.
NonStop NS1200 and NS1000 Blade Element Processors
The NonStop NS1200 or NS1000 blade element is a server blade that contains a single
microprocessor and is configured as one logical processor. NonStop NS1200 and NS1000
systems can include up to eight blade elements. There are no logical synchronization units (LSUs)
in a NonStop NS1200 or NS1000 system. For more information on NonStop NS1200 and
NS1000 systems, see “Differences Between NonStop NS-Series Systems” (page 36) and the
appropriate Planning Guide.
All input and output to and from each NonStop blade element is passed via the ServerNet fabrics.
A ServerNet fabric is a complex web of links that provide a large number of possible paths from
one point to another. Two communications fabrics, the X and Y ServerNet fabrics, provide
redundant, fault-tolerant communications pathways. If a hardware fault occurs on one of the
ServerNet fabrics, communications continues on the other with hardware fault recovery transparent
to all but the lowest level of the OS.
In NonStop NS1200 or NS1000 systems, ServerNet switches control ServerNet communications,
rather than the p-switches found in NonStop NS16000 series systems. In NonStop NS1200 systems,
the ServerNet switches are in the VIOs. In a NonStop NS1000 system, the ServerNet switches are
in the VIOs or IOAM enclosure. There is one ServerNet switch for each of the ServerNet fabrics.
Monitoring and Maintaining Processors
To monitor processors, use OSM, the ViewSys product, and other tools. Monitoring and maintaining
processors includes:
• “Monitoring Processors Automatically Using TFDS” (page 125)
• “Monitoring Processor Status Using the OSM Low-Level Link” (page 125)
• “Monitoring Processor Status Using the OSM Service Connection” (page 125)
• “Monitoring Processor Performance Using ViewSys” (page 128)
• Chapter 5 (page 77)
124 Processors and Components: Monitoring and Recovery