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A restore session is started interactively. You tell Data Protector what to restore, let
Data Protector determine the needed media, select some options and start the restore.
You and other users can monitor the progress of the session.
Restore session data flow and processes
What happens in a restore session?
When a restore session, as shown in Figure 65 on page 227, is started, the following
happens:
1. The Restore Session Manager (RSM) process is started on the Cell Manager
system. This process controls the restore session.
2. The RSM opens the IDB, reads the information about media needed for restore,
and writes the information about the restore session to the IDB, such as generated
messages.
3. The RSM starts Media Agents (MAs) on the systems with devices used for restore.
For each drive used in parallel, a new Media Agent is started.
4. The RSM starts Disk Agents (DAs) for each disk restored in parallel. The actual
number of Disk Agents started depends on the objects you selected for restore.
For more information, see “Parallel restores” on page 228.
5. Media Agents read data from media and send it to the Disk Agents that write
the data to disks. The RSM monitors the progress of the session and starts new
Disk Agents and new Media Agents as necessary.
6. When the restore session is completed, the RSM closes the session.
How Data Protector operates226