HP 3PAR Remote Copy Software - Manual (Page 277)

C.59 Synchronous Long Distance Remote Copy Disaster Recovery Example
InForm OS Version 2.3.1 Remote Copy User’s Guide
C.5.2 Asynchronous Backup Server Assumes Role of Primary Server
In this scenario, the primary server has gone down and the asynchronous periodic backup
server is put into failover mode to assume the role of the primary server. During failover, the
synchronous backup server temporarily assumes the role of the primary server in order to
transfer its data to the asynchronous periodic backup server. Once the data transfer has
completed, the asynchronous periodic backup server assumes the role of the primary server.
Figure C-9. Asynchronous Periodic Server become the Primary Server (after data push)
When InServA goes down, issuing showrcopy on the backup servers InServB and InServC
appears as follows:
InServA InServB
InServC
(primary) (primary)
(backup)
Asynchronous
Periodic
InServB
InServC
(primary)
(primary)
Asynchronous
Periodic
(data push)
___________________________
Phase 1: InServB temporarily
assumes the role of the primary
server and pushes the last synced
data from InServA to InServC. ___________________________
Phase 2: InServC becomes the
primary server and mirrors to
InServB.