HP-UX System Administrator's Guide: Overview HP-UX 11i v3 (B3921-90011, September 2010)

Installed Product
Database
A database of software currently installed on a server, created and maintained by the Software
Distributor suite of utilities. See “Software Distributor (SD)” (page 100).
Integrity VM
guest
An instance of HP-UX running within an Integrity virtual machine.
interleaved swap Swap space spanning multiple physical devices for read/write efficiency, similar to disk striping.
See also disk striping.
JBOD An acronym meaning Just a Bunch of Disks and representing a group of disk devices
concatenated together to be treated as though they were a single large device.
kernel The nucleus of the HP-UX operating system. Comprised of drivers and other code modules,
the kernel centrally controls nearly all of the essential functions of an operating system (for
example, memory management, communication between hardware and software, and process
scheduling).
kernel modules Modular chunks of code that collectively make up the kernel. Some modules require a reboot
in order to be added to (or removed from) a kernel, others do not.
kernel tunables Variables within the kernel that govern various kernel functions (for example, how many
processes can simultaneously exist, or how physical memory is allocated). By altering the values
of these variables the kernel’s behavior can be influenced (“tuned”).
lazy swap When a process is scheduled, enough swap space is usually reserved just in case the process
needs to be paged out of physical memory to make room for other running processes.
Often, swap space is reserved but never used because the process it was reserved for did not
get paged out, or only portions of it did. This results in wasted swap space. When enabled, lazy
swap causes swap space to be reserved at the time memory contents for a process are actually paged
out, rather than when the process is scheduled, yielding more efficient swap space utilization.
Legacy View A view of the I/O device tree using physical hardware path addresses and legacy device special
files.
See also Agile View.
line printer
spooling system
An HP-UX subsystem used to control the flow of printing in order to:
prevent intermixed listings•
• prioritize print jobs
• control who can use specific printers
• allow for printer maintenance
• group printers to associate them with a single print queue (See “printer class”)
local printer A printer that is physically attached to a server and directly controlled by the Line Printer
Spooling System of an HP-UX instance running on that server.
logical volume A subdivision of a volume group, a logical volume can span multiple physical volumes or
represent only a portion of one physical volume.
The size of a logical volume is measured in units called extents. The size of logical volumes can
be altered after they are initially created. Logical volumes can be extended and, if their contents
permit, reduced.
Once created, logical volumes can be treated just like disk partitions. They can be used for file
systems, swap space, as dump devices, or for raw disk access.
LUN hardware
path
A virtual hardware path that represents the device itself, not the hardware path to it. A LUN
hardware path represents all physical paths (“lunpath hardware paths”) to the LUN it represents.
The first path element in a LUN hardware path is 64000, followed by a virtual bus address
and virtual LUN ID. For example: 64000/0xfa00.0x22.
lunpath hardware
path
An individual physical hardware path to a mass storage device (usually a disk). Lunpath
hardware paths are composed of a series of bus-nexus addresses separated by / (slash) characters
leading up to the Host Bus Adapter (HBA). Beneath the HBA, additional address elements are
represented in hexadecimal. The first elements represent a transport-dependent target address.
The final element is a LUN address, which is a 64-bit representation of the LUN identifier
reported by the targeted device.
See also LUN hardware path and persistent device special file.
112 Glossary