Rules for an external restore

The following rules apply to external restores:

• You must externally restore from an external backup. Although the external backup is treated as a level-0 backup, it might actually be an incremental backup not related to HCL Informix®.
• A warm external restore restores only noncritical storage spaces.
• You cannot externally restore temporary dbspaces.
• You cannot externally restore from regular ON-Bar backups.
• You cannot verify that you are restoring from the correct backup and that the storage media is readable with ON-Bar.
• If the external backups are from different times, the external restore uses the beginning logical log from the oldest backup.
• You cannot perform a mixed restore. If critical dbspaces must be restored, you must perform a full cold restore.

The following rules apply to external cold restores:

• Salvage the logical logs (onbar -b -l -s) before you switch the disks that contain the critical storage spaces.
• If you are restoring critical dbspaces, the database server must be offline.
• Point-in-time external restores must be cold and restore all storage spaces.
• The external backups of all critical dbspaces of the database server instance must be simultaneous. All critical dbspaces must have to be backed up within the same set of onmode -c block … onmode -c unblock commands.