Environment

Each location contains a system that supports Policy-based High Availability (HA) with Fibre Channel or Ethernet ( short distances using RDMA) network connectivity between them.

The locations are sufficiently far apart such that anticipated disruptions affect only one location. The locations are sufficiently close together to not cause the response time for I/O to exceed the maximum that an application can tolerate because of latency in replication link communications. For policy-based High Availability, a maximum of 1 ms RTT (Round-Trip Time) inter site latency is supported.

Both systems have access to an external IP quorum app to arbitrate if a site or system loss occurs. Multiple quorum applications can be deployed for redundancy.

Hosts in a high-availability solution must use an ALUA-compliant multipath policy. For more information, see Host attachment.