NonStop NS-Series Operations Guide (H06.12+)

9 Processors and Components: Monitoring and Recovery
• “When to Use This Section” (page 103)
• “Overview of the NonStop Blade Complex” (page 103)
• “Monitoring and Maintaining Processors” (page 106)
— “Monitoring Processor Status Using the OSM Low-Level Link” (page 106)
— “Monitoring Processor Status Using the OSM Service Connection” (page 107)
— “Monitoring Processor Performance Using ViewSys” (page 108)
• “Identifying Processor Problems” (page 109)
— “Processor or System Hangs” (page 109)
— “Processor Halts” (page 109)
— “OSM Alarms and Attribute Values” (page 110)
• “Recovery Operations for Processors” (page 110)
— “Recovery Operations for a Processor Halt” (page 110)
— “Halting One or More Processors” (page 111)
— “Reloading a Single Processor on a Running Server” (page 111)
— “Recovery Operations for a System Hang” (page 115)
— “Enabling/Disabling Processor and System Freeze” (page 115)
— “Freezing the System and Freeze-Enabled Processors” (page 115)
— “Dumping a Processor to Disk” (page 116)
— “Backing Up a Processor Dump to Tape” (page 118)
— “Replacing Processor Memory” (page 118)
— “Replacing the Processor Board and Processor Entity” (page 118)
— “Submitting Information to Your Service Provider” (page 119)
• “Related Reading” (page 120)
When to Use This Section
Use this section to monitor processors and to perform recovery operations such as processor
dumps.
Overview of the NonStop Blade Complex
NOTE: This section does not apply to Integrity NonStop NS1200 and NS1000 systems, which
use the NSVA rather than NSAA architecture (see NonStop System Architectures on page 2-2).
For more information on Integrity NonStop NS1200 and NS1000 systems, see Differences Between
Integrity NonStop NS-Series Systems in the appropriate Planning Guide or Installation Manual.
The basic building block of the modular NonStop advanced architecture (NSAA) compute engine
is the NonStop Blade Complex, which consists of two or three processor modules called NonStop
Blade Elements. Each Blade Element houses two or four microprocessors called processor elements
(PEs). A logical processor consists of one processor element from each Blade Element. Although
a logical processor physically consists of multiple processor elements, it is convenient to think
of a logical processor as a single entity within the system. Each logical processor has its own
memory, its own copy of the operating system, and processes a single instruction stream. NSAA
logical processors are usually referred to simply as “processors.”
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 a logical processor, ensuring that all NonStop Blade
Elements agree on the result before the data is passed to the ServerNet fabrics.
When to Use This Section 103