Database hot standby as disaster recovery with remote copy function
Original Publication Date: 2005-Jan-04
Included in the Prior Art Database: 2005-Jan-04
SAP wrote an API for the RunTimeEnvironmentHotStandbyStorage (RTEHSS) with the following aim, "This API tries to establish an abstract layer between the storage system used and the SAPDB liveCache database. It is used internally by the SAPDB liveCache runtime environment only. It can be expanded due to needs of any storage solution, that wants to support liveCache HotStandby." [SAP description, RTEHSSDraft.pdf] The API considers that two database servers are connected to one storage subsystem. This consideration is not adequate to also cover disaster recovery aspects. Therefore two storage systems are required. This invention describes in detail how the existing API could be used to implement a disaster recovery solution for two sides. A extension to three and more sides could be implemented easily using the same structures. Other storage subsystems than IBM TotalStorage products, could also be used if they support the functionality SAP is requesting within their API.