GDPS easily monitors and manages your MGM pairs, and it also allows clients to run disaster  recovery tests without affecting production. These features lead to faster recovery from real  disaster events. Using GDPS/Active-Active, the DS8880 R8.2 and later levels provide z/OS with a read-only  access capability to a Metro Mirror secondary device, allowing a fast failover capability with  the Zero Data Loss option. Reads are allowed if the device is full-duplex or suspended, but  prevented if the device is in a pending state. GDPS/Active-Active provides monitoring and management of the Zero Data Loss  environment. IBM InfoSpherefi Data Replicator for DB2 enables you to read DB2 log data from a Metro  Mirror secondary device. GDPS functions include the following examples: GLYPH<SM590000> The option to hot swap between primary and secondary Metro Mirror is managed  concurrently with client operations. Operations can continue if a disaster or planned  outage occurs. GLYPH<SM590000> Disaster recovery management in a disaster at the primary site allows operations to  restart at the remote site quickly and safely while data consistency is continuously  monitored. GLYPH<SM590000> GDPS freezes the Metro Mirror pairs if a problem with mirroring occurs. It restarts the copy  process to secondaries after the problem is evaluated and solved, maintaining data  consistency on all pairs. For more information about GDPS, see  IBM GDPS Family: An Introduction to Concepts and  Capabilities , SG24-6374. Chapter 5. DS8000 Copy Services overview  153