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Dynamic Root Disk Administrator's Guide: HP-UX 11i v2, HP-UX 11i v3 > Chapter 1 About Dynamic Root Disk

Conceptual Overview

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Dynamic Root Disk (DRD) is a software tool containing a set of commands that enable you to clone a system image to another hard disk and modify the image without shutting down the system. DRD significantly reduces system downtime and allows you to do software maintenance during normal business hours.

Using DRD, you can perform software maintenance on the cloned (inactive) system image without affecting the active system image. When modifications are complete, you can boot the cloned system image on the original system or on a different system. If you do not want to use the cloned system image immediately, you can leave it in place to be utilized at a later time.

Other uses of DRD include using the clone for quick software recovery or using the clone to boot another system, which is referred to as rehosting. For details of rehosting, see Rehosting and Unrehosting Systems.

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