White Paper

critical file systems The subset of file systems in a system image that will be cloned during a drd
clone operation
.
Currently, the critical file systems are those in the LVM volume group or VxVM
disk group containing the root (“/”) file system
.
DRD
Dynamic Root Disk. The collection of utilities that manages creation, modification,
and booting of system images
.
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 the
inactive system image without modifying any part of the booted system image.
There is no requirement that the package can be configured (using swconfig) on
the inactive system image
. The package should be fully functional, either when it is
installed on the inactive system image and the inactive system image is subsequently
booted, or when it is installed directly to a booted system image
.
Examples of components of the booted system image 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 the runcmd environment without
modifying any part of the booted system image.
hot maintenance
The ability to perform modifications to the inactive system image, using commands
issued on the booted system image, without affecting the booted system image
.
hot recovery
See recovery
inactive system
image
A system image that is not the booted system image. This system image can be
modified while the booted system image remains in production
.
IPD
Installed Product Database. This is the database used by software management tools
to keep track of what is installed on a system and information about the installed
software state
.
LVM
Logical Volume Manager. The logical volume manager (LVM), a subsystem that
manages disk space, is supplied at no charge with HP-UX
.
OE
Operating Environments are tested and integrated application bundles designed to
work with the operating system and provide the functionality needed for your
system’s purpose.
original system
environment
A booted system image whose system image is cloned to create another system
image. Each system image has exactly one original system environment (that is, the
booted system image at the time the drd clone command was issued)
.
PSF
Product Specification File. A file created to define a software package created with
HP Software Distributor (SD)
.
recovery
The ability to boot the inactive system image in the event of critical system
problems. Also referred to as system recovery or hot recovery
.
restore
The ability to retrieve user data that was previously archived
.
root file system The file system that is mounted at /.
runcmd
environment
The environment provided by drd runcmd to isolate changes to the inactive
system image.
shared file systems The subset of file systems in a system image that will NOT be cloned during a drd
clone operation, but will be mounted when the clone is booted
.