NonStop System Glossary

megabyte (MB)
A unit of measurement equal to 1,048,576 bytes (1024 kilobytes). See also gigabyte (GB), kilobyte
(KB), and terabyte (TB).
MEM_BACKUP
The action taken by TNS/E millicode to store processor memory to disk before entering
LOW_POWER mode.
member
In a structured programming language, an addressable entry within a data structure. A member
can be a simple field or a data structure.
memory board
A board that holds the memory DIMMs for all the processor elements in a NonStop Blade Element.
memory copy
A phase of reintegration in which the memory is copied from a functioning processor element to
the replaced or added processor element.
memory-exact point
A potential breakpoint location within an accelerated object file at which the values in memory
(but not necessarily the values in registers) are the same as they would be if the object file were
running in TNS interpreted mode or on a TNS system. Most source statement boundaries are
memory-exact points. Complex statements might contain several such points: at each function call,
privileged instruction, and embedded assignment. Contrast with register-exact point and nonexact
point.
memory manager
A NonStop operating system process that implements the paging scheme for virtual memory. This
process services requests generated by different interrupt handlers as well as by other system
processes.
memory page
A unit of virtual storage. In TNS systems, a memory page contains 2048 bytes. In TNS/R systems,
the page size is determined by the memory manager and can vary, depending on the processor
type.
memory quad
A set of four memory slots on a NonStop Blade Element processor board.
memory slot
A physical, labeled space for a memory unit or a dual inline memory module (DIMM). Memory
slots are located on the processor board of a NonStop S-series processor multifunction (PMF)
customer-replaceable unit (CRU) or a NonStop Blade Element.
memory unit
A unit consisting of a dual inline memory module (DIMM) or a single inline memory module (SIMM)
that is installed in groups of four on the processor and memory board (PMB) of the processor
multifunction (PMF) customer-replaceable unit (CRU) in a NonStop S-series server. Memory units
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