| 摘要 |
A method and system for preserving access of a system in case of disaster having a primary filestore and a primary system database, comprising: a replica system having a replica filestore and a replica system database; having a second empty filestore for recording all changes to the primary filestore; and having at least one database trigger on each primary system table save those that uniquely identify the primary system on the network fabric for catching recording and transferring , reference data to the replica system database which has been inserted deleted and or been updated in the primary system table ; and at least one access preservation table for storing access preservation data ; and at least one transaction table one being placed on the replica, and primary system for storing all the transactions, and reference data on the basis of earliest recorded time; and at least one database procedure to carry out asynchronously fast forward or rollback changes in the metadata and or filestore by using the transaction tables, access preservation tables and the second replica filestore.
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