Manualshelf

NonStop System Glossary

ManualsBrandsHP ManualsServerHP NonStop G-Series
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logical processor
1. The combination of equivalent processor elements in the NonStop Blade Elements that are
running in the same instruction stream in loose lock-step.
2. In a NonStop BladeSystem, a set of cores sharing the same memory. A logical processor in
a NonStop BladeSystem takes the traditional NonStop logical processor and extends it to a
multiprocessor:
• One X and Y ServerNet interface per logical processor.
• All IPUs in a logical processor share the same memory map (except small per-IPU anchor
area for low-level software).
logical segment
A single data area consisting of one or more consecutive 128-kilobyte unitary segments that is
dynamically allocated by a process. The two types of logical segments are selectable segments
and flat segments. See also selectable segment and flat segment.
logical synchronization unit (LSU)
The combination of the LSU logic board and the LSU optics adapter. An LSU serves one logical
processor.
logical unit number (LUN)
1. A unique number used on a SCSI bus to differentiate between devices on the bus.
2. The logical unit in the Enterprise Storage System (ESS) that maps the LDEV onto a port.
Specification of the port and LUN specifies an LDEV.
login
The activity by which a user establishes a locally authenticated identity on a server. Each login
has one login name.
login name
A user name associated with a session.
logon sequence
The process through which the NonStop server to be managed is determined, the security constraints
to interact with that server are met, and a connection with that server is established.
low-level link
A connection between the OSM or TSM client software running on a system console and the master
service processors (MSPs) on a NonStop S-series server. When the NonStop operating system is
not running, communication must take place over a low-level link. You can also communicate with
a NonStop S-series server over a low-level link when the operating system is running. See also
service connection.
low PIN
A process identification number (PIN) that is in the range 0 through 254. Contrast with high PIN.
LOW_POWER
The power state in which modules are placed to conserve UPS battery power.
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