Performing an external backup
About this task
The database server must be online or in quiescent mode during an external backup.
To perform an external backup without disk mirroring:
Procedure
- To obtain an external backup, block the database server
with the onmode -c block command.The system takes a checkpoint and suspends all update transactions. Users can access the database server in read-only mode.
- To back up the storage spaces and administrative files,
use a copy command, such as cp, dd,
or tar on UNIX™ or copy on Windows™, or a file-backup program.
You must back up all chunks in the storage spaces.
- To allow normal operations to resume, unblock the database server with the onmode -c unblock command.
- Back up all the logical logs including the current log
so that checkpoint information is available for the external restore.
Important: Because external backup is not done through ontape, you must ensure that you have a backup of the current logical log from the time when you execute the onmode -c block command. Without a backup of this logical-log file, the external backup is not restorable.
- After you perform an external backup, back up the current log. using the ontape -a command.