Glossary

The system environment that is currently running — also known as the current, active, or running system environment.

Command line user interface

* (noun) - clone - a Cloned System Image . * (verb) - clone - to create a Cloned System Image.

A copy of the booted volume group from the system image of a booted system environment — 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.

Dynamic Root Disk. The collection of utilities that manages creation, modification, and booting of system images.

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.

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 Using the Dynamic Root Disk Toolset white paper, which is available at: http://docs.hp.com/en/oshpux11iv2.html#Dynamic%20Root%20Disk.

See Hot Recovery

The ability to perform modifications to an inactive system image using commands issued on the booted system environment without affecting the booted system environment.

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.

Logical Volume Manager. A subsystem that manages disk space — supplied at no charge with HP-UX.

A booted system environment whose system image is cloned to create another system image. Each system image has exactly one original system environment. (That is, the booted system environment at the time the drd clone command was issued.)

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.

The file system that must be mounted at /.

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.

The combination of the system image and the system activities that comprise a running installation of HP-UX.

The file systems and their contents that comprise an installation of HP-UX — residing on disk and therefore persisting across reboots.

See Hot Recovery

DRD command that removes the system information file, EFI/HPUX/SYSINFO.TXT, from a disk that was rehosted, optionally preserving a copy in a file system on the booted system.

Veritas Volume Manager