Administrator Guide

Synchronous replication use cases
21 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
High consistency synchronous with consolidated vSphere or Hyper-V sites
A replication link or destination volume issue in St. Paul results in a VM outage in Minneapolis
4.2.2 Microsoft SQL Server and Oracle Database/Oracle RAC
Database servers and clusters in critical environments are often designed to provide highly available, large
throughput, and low latency access to data for application tier servers and sometimes directly to application
developers or end users. Database servers differ from virtual machines in that protection of the database
volumes is paramount while protection of the operating system is not required for data recovery. However,
booting from SAN and replicating that SAN volume to a remote site with compatible hardware can drastically
improve RTO. Similar to virtual environments, the critical data may be spread across multiple volumes. When
designing for performance, application, or instance isolation, this is often the case. Unless the replication is
paused, consistency between volumes is guaranteed in high consistency mode because the write order at the
destination will mirror the write order at the source, otherwise the write will not happen in either location (see
Figure 15). This is the fundamental premise of high consistency mode detailed in section 3.1.2.
High consistency synchronous with databases