HP Dynamic Root Disk (DRD) manual Glossary, Booted system

Glossary

Booted system	The system environment that is currently running — also known as the current, active, or running
environment	system environment.
CLI	Command line user interface
Clone	* (noun) - clone - a Cloned System Image . * (verb) - clone - to create a Cloned System Image.
Cloned system	A copy of the booted volume group from the system image of a booted system environment —
image	produced by the drd clone command. A cloned system image may be inactive, or the cloned
	system image may be booted, in which case the system activities are started and the clone
	becomes the system image in the booted system environment. When a particular system image
	is booted, all other system images are inactive. A system administrator may modify a cloned
	system image by installing software on it using the drd runcmd command.
DRD	Dynamic Root Disk. The collection of utilities that manages creation, modification, and booting
	of system images.
DRD-chrooted shell	The modification environment provided by the DRD utilities for managing (swinstalling, swremoving,
	and swverifying) software to and from an inactive system image while logged on to a booted
	system environment. Because the POSIX shell is running in an environment provided by the chroot
	command, modifications to the booted system environment's files are prevented. In addition, the
	file systems of the inactive system image, mounted under the chroot directory, are available
	for software management on the inactive system image.
DRD-safe	Refers to software packages for HP-UX, as well as to HP-UX commands. A package is DRD-safe
	if it can be swinstalled, swremoved, and swverified on an inactive system image without modifying
	any part of the booted system environment. There is no requirement that the package can be
	configured on an inactive system image. Examples of components of the booted system environment
	that cannot be changed are: the installed software, file systems, device configuration, process
	space, kernel definition, networking configuration, users and passwords, and auditing and
	security. A command is DRD-safe if it can be run in a DRD runcmd environment without modifying
	any part of the booted system environment. Further information on DRD-safe is available in the
	Dynamic Root Disk: Quick Start & Best Practices white paper, which is available at http://
	www.hp.com/go/drd-docs.
Hot backup	See Hot recovery
Hot maintenance	The ability to perform modifications to an inactive system image using commands issued on the
	booted system environment without affecting the booted system environment.
Hot recovery	The ability to return to a known good system environment simply by booting. That is, have a
	backup system image standing by waiting to be used. Sometimes referred to as hot backup.
LVM	Logical Volume Manager. A subsystem that manages disk space — supplied at no charge with
	HP-UX.
Original system	A booted system environment whose system image is cloned to create another system image.
environment	Each system image has exactly one original system environment. (That is, the booted system
	environment at the time the drd clone command was issued.)
Rehost	The capability to boot a DRD clone of an LVM-managed Itanium-based copy of HP-UX 11i v3 on
	a system other than the one where it was created. DRD provides the drd rehost command
	that copies the system information file—containing hostname, IP address, and other system-specific
	information—to EFI/HPUX/SYSINFO.TXT on the disk to be rehosted.
Root file system	The file system that must be mounted at /.
System activities	All of the running processes that correspond to programs on a booted system. This includes the
	running kernel, all network processes, all daemons and all other processes — both system and
	user. System activities frequently access in-memory copies of data. Thus any change to in-memory
	data may affect system activities.
System	The combination of the system image and the system activities that comprise a running installation
environment	of HP-UX.

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