AW: Mirror / Raw device / Informix

Art Kagel wrote: > > There are better solutions however. As hinted by others, > Informix provides > two levels of database replication that can be used to > maintain a secondary > server which is either a hot backup system for failovers only > or which is > indeed a live server which can be accessed anytime with > up-to-date data. > > These are respectively known as HighAvailability Data > Replication (HDR) and > Enterprise Replication (ER). Neither uses OS or disk vendor > services for > replication. There is a third option, you may use the perpetual restore method where you keep a secondary instance in logical recovery mode and constantly feed logical logs with onbar as the get produced on the production side. (relies on the imported restore and the fact that IDS can suspend logical recovery after a failure to retrieve an object from the storage manager. The method has been developed by Bob Weiman (a former 3rd level support engineer at Informix), and is described in a Technote available at http://www.ibm.com/support/docview.wss?rs=630&context=SSGU8G&q1=perpetua l+restore&uid=swg21210590&loc=en_US&cs=utf-8&lang=en Regards Tilman