3PAR Remote Copy 2.3.1 User's Guide (320-200175 Rev A, October 2009)

C.80
Synchronous Long Distance Remote Copy Disaster Recovery Example
Remote Copy User’s Guide InForm OS Version 2.3.1
C.5.3 Asynchronous Backup Server Assumes Role of Primary Server - No Data
Transfer from the Synchronous Backup Server
In this scenario, the primary server has gone down. The data on the asynchronous periodic
backup server is the most current and put into failover mode to assume the role of the primary
server. Because the data on the synchronous backup server is not the most up-to-date, there is
no data transfer from the synchronous backup server to the asynchronous periodic backup
server before the asynchronous periodic backup server assumes the role of the primary server.
Figure C-10. Asynchronous Periodic Server becomes the Primary Server
InServA
(primary)
InServB
InServC
(primary)
(primary)
Asynchronous
Periodic