ON-Bar for Dynamic Server

Figure 7 shows the following components of ON–Bar for Dynamic Server:

• Storage spaces (dbspaces, blobspaces, and sbspaces) and logical logs to be backed up or restored
• The ON–Bar catalog tables in the sysutils database
• The onbar script (onbar.sh on UNIX or onbar.bat on Windows)
• The onbar-driver (onbar_d)
• The XBSA shared library for the storage manager on your system

  Use either ISM, TSM, or a storage manager that a third-party vendor provides.

• Backup data on storage media
• The ON–Bar activity log
• The ON–Bar emergency boot file

ON–Bar communicates with both the database server and the storage manager. Use the onbar command to start a backup or restore. For a backup session, ON–Bar requests the contents of storage spaces and logical logs from the database server and passes them to the storage manager. The storage manager stores the data on storage media. For a restore session, ON–Bar requests the backed up data from the storage manager and restores it on the database server.

If you specify a parallel backup or restore, the onbar-driver (onbar_d) creates child onbar_d processes that perform backup and restore operations. Each child processes one storage space, then returns. ON–Bar processes log files serially. If you specify a serial backup or restore, the onbar-driver performs the operation one object at a time.

The onbar_d processes write status and error messages to the ON–Bar activity log and write information to the emergency boot file that is used in a cold restore. For more details, see Backup Sequence on Dynamic Server.

Figure 7. ON-Bar Components for Dynamic Server