HP B6960-96035 Concepts Manual page 129

operation can begin. This includes repartitioning and/or reformatting the boot partition
and recovery of the operating system with all the configuration information that
defines the environment. This has to be completed in order to recover other user data.
After a computer disaster has occurred, the system (referred as target system) is
typically in a non-bootable state and the goal of Data Protector disaster recovery is
to restore this system to the original system configuration. The difference between the
crashed and the target system is that the target system has all faulty hardware
replaced.
A disaster is always serious, however the following factors can exacerbate the
situation:
• The system needs to be returned to online status as quickly and efficiently as
possible.
• Administrators are not familiar with the required steps to perform the disaster
recovery procedure.
• The available personnel to perform the recovery have only fundamental system
knowledge.
Disaster recovery is a complex task that involves extensive planning and preparation
before execution. You need to have a well-defined, step-by-step process in place to
prepare for, and recover from, disastrous situations.
The disaster recovery process consists of 4 phases:
1. Phase 0 (planning/preparation) is the prerequisite for a successful disaster
recovery.
CAUTION:
It is too late to prepare for a disaster recovery once a disaster has occurred.
2. In Phase 1, DR OS is installed and configured, which usually includes
repartitioning and reformatting of the boot partition, since the boot or system
partition of the system are not always available and the environment needs to
be recovered before normal restore operations can resume.
3. In Phase 2, the operating system with all the configuration information that defines
the environment with Data Protector (as it was) is restored.
4. Only after phase 2 is completed, is the restore of applications and user data
possible (Phase 3). A well-defined, step-by-step process has to be followed to
ensure a fast and efficient restore.
Concepts guide 129