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Disaster Recovery
Preparing for a Disaster Recovery
Chapter 10 445
On Windows, while the system is up and running, many system files
cannot be replaced because the system keeps them locked. For example,
the user profiles that are currently being used cannot be restored. The
login account has to be changed or the relevant service has to be stopped.
Data consistency of an application can be violated depending on what is
active on the system when the backup runs, thereby causing re-start and
execution issues after recovery.
How to Create a
Consistent and
Relevant Backup?
✓ Ideally, you would perform a backup with the relevant partition(s) set
off-line, which is usually not possible.
✓ Examine the activity on the system during the backup. Only
operating system related processes and database services which are
backed up online can remain active during the backup execution.
✓ None of the low-level (UNIX) or background-level (Windows)
application specific services should be running.
Updating the System Recovery Data (SRD)
What Is SRD? System recovery data (SRD) is a Unicode text file that contains
information required for the configuration and restore of the Windows
target system. A SRD file is generated when CONFIGURATION backup is
performed on a Windows client and then stored in
<Data_Protector_home>\Config\dr\srd (Windows Cell Manager) or
in /etc/opt/omni/dr/srd/ (UNIX Cell Manager).
IMPORTANT When IDB is not available, information about objects and media is stored
only in SRD file.
The SRD filename on the Cell Manager is identical to the hostname of
the computer where it was generated - for example
computer.company.com.
After the CONFIGURATION backup, the SRD contains only system
information required for installation of the DR OS. In order to perform a
disaster recovery, additional information about backup objects and