Dynamic Root Disk (DRD):
- Dynamic Root Disk (DRD) is an HP-UX system administration toolset that lets you create and modify an inactive system image without shutting down the system. To do this, you can clone the active system image and modify the cloned (inactive) system image while the system is running. When ready, you can boot the cloned image. Usually, the only downtime required is the rebooting process.
- System administrators use DRD to manage system images on HP PA-RISC and Itanium® -based systems
The DRD commands are:
1. It can help to reduce the downtime required to perform system maintenance and updates.
2.we can ou create and modify an inactive system image (clone) without shutting down the system (DT required to reboot the system only)
3.Automatically synchronise the active image and the clone
4.Ability to sync file system and volume group information
* Operating systems supported: HP-UX 11i v2 (11.23) September 2004 or later, HP-UX 11i v3 (11.31)
* Root Volume Groups supported:
o VxVM 4.1, VxVM 5.0
o DRD A.3.5. and earlier: HP-UX 11i v2: LVM 1.0; HP-UX 11i v3: LVM 1.0
o DRD A.3.6. and later: HP-UX 11i v2: LVM 1.0; HP-UX 11i v3: LVM 1.0 and LVM 2.2
* Hardware supported: All HP PA-RISC and Itanium®-based servers and workstations that support HP-UX 11i v2 or HP-UX 11i v3: Hard partitions (nPars), Virtual partitions (vPars), Integrity Virtual Machines (Integrity VMs)