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Disaster Recovery
Introduction
Chapter 10 441
• user profiles volume
• Certificate Server database volume on Windows Server
• Active Directory Service volume on domain controller on Windows
Server
• quorum volume on Microsoft Cluster Server.
What is Online
Recovery?
Online recovery is performed when Cell Manager is accessible. In this
case most of Data Protector functionalities are available (Cell Manager
runs the session, restore sessions are logged in the IDB, you can monitor
the restore progress using GUI, etc.).
What is Offline
Recovery?
Offline recovery is performed if the Cell Manager is not accessible (for
example, due to network problems, Cell Manager has experienced a
disaster, online recovery has failed, etc.). Only standalone and SCSI-II
Library devices can be used for offline recovery. Note that recovery of
Cell Manager is always offline.
What is
Local/Remote
Recovery?
Remote recovery is performed if all Media Agent hosts specified in SRD
file are accessible. If any of them fails, disaster recovery process fails
over to local mode. This means that the target system is searched for
locally attached devices. If only one device is found, it is automatically
used. Otherwise Data Protector prompts you to select the device which
will be used for restore. Note that offline OBDR is always local.
Disaster is always serious, however the following factors can exacerbate
the situation:
• The system has 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 may only have
fundamental system knowledge.
Disaster recovery is a complex task that involves extensive planning and
preparation before execution. You have to have a well-defined,
step-by-step process in place to prepare for, and recover from, disastrous
situations.