Data disaster-tolerance system and method

The system includes parts: production equipment; disaster tolerance equipment; data reproduction system; switching system. The data reproduction system includes units: data reproduction unit of database in use for reproducing data in database in production equipment to database in disaster tolerance equipment; data reproduction unit of non-database in use for reproducing data of non-database from the production equipment to disaster tolerance equipment. The invention also discloses relevant method: reproducing initial data from production equipment to tolerance equipment; reproducing dynamic changed data of database and non-database from production equipment to tolerance equipment; when production equipment is abnormal, switching in disaster tolerance is carried out; disaster tolerance equipment instead of production equipment provides service. Features are: accessible to disk of disaster tolerance equipment when data reproduction is carried on so as to raise switching speed.