The R1 array, comprising one or more R1 hosts directly attached via SCSI or Fibre Channel to a Symmetrix array containing SRDF R1 devices.
The R2 array, comprising one or more R2 hosts directly attached via SCSI or Fibre Channel to a Symmetrix array containing SRDF R2 devices. The R2 devices are paired with the R1 devices in the R1 array. These R2 hosts and the array must be at a significant distance from the R1 side to survive a disaster that may occur at the R1 side.
Network heartbeats, LLT or TCP/IP, between the two data centers to determine their health. See Cluster Heartbeats for more information.
In a replicated data cluster environment, all hosts are part of the same cluster. You must connect them with dual, dedicated networks that support LLT.
In a global cluster environment, you must attach all hosts in a cluster to the same Symmetrix array.
In parallel applications such as VERITAS Storage Foundation for Oracle RAC, all hosts attached to the same array must be exclusively part of the same GAB membership. VERITAS Storage Foundation for Oracle RAC is supported with SRDF only in a global cluster environment and not in a replicated data cluster environment.
