EMC CX500I Configuration Guide - Page 74

Data Replication and Data Mobility Software Storage System 1 then acknowledges the write to the production host. Database Server 2, the other host, has no direct access to the mirrored data. (The standby site does not need a server at all.) This server runs applications that access other data stored on Storage System 2. If a failure occurs in either the production host or Storage System 1, an administrator can use the management station to promote the image on Storage System 2 to the primary image. Then the appropriate applications can start on any connected server (here, Database Server 2) with full access to the data. The mirror will be accessible in minutes, although the time needed for applications to recover will vary. Highly available cluster File Server Mail Server Operating system A Operating system A Database Server 1 Operating system B Accounts Server Operating system A Database Server 2 Operating system B Adapter Adapter Adapter Adapter Adapter Adapter Adapter Adapter Adapter Adapter FC Switch or LAN FC Switch or LAN FC Switch or LAN FC Switch or LAN Cluster Storage Group Database Server Storage Group (Primary Images) SP A SP B LUN LUN LUN LUN LUN LUN LUN Extended Distance Connections Accounts Server Storage Group Accounts Server Storage Group Secondary Images SP A SP B LUN LUN LUN LUN LUN LUN LUN Storage system 1 Figure 4-3 Sample MirrorView Configuration Storage system 2 EMC2000a 4-12 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide