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Dell EMC Metro node 7.0.1 Product Guide

About metro node resilience and integrity

With metro node, you get true high availability. Operations continue and data remains online even when a failure occurs. Within synchronous distances (metro node Metro), think of metro node as providing disaster avoidance instead of just disaster recovery.

Metro node Metro provides shared data access between sites. The same data (not a copy), exists at more than one location simultaneously. metro node can withstand a component failure, a site failure, or loss of communication between sites and still keep the application and data online and available. Metro node clusters are capable of surviving any single hardware failure in any subsystem within the overall storage cluster, including host connectivity and memory subsystems. A single failure in any subsystem does not affect the availability or integrity of the data.

Metro node redundancy creates fault tolerance for devices and hardware components that continue operation as long as one device or component survives. This highly available and robust architecture can sustain multiple device and component failures without disrupting service to I/O.

Failures and events that do not disrupt I/O include:

  • Unplanned and planned storage outages
  • SAN outages
  • Metro node component failures
  • Metro node cluster failures
  • Data center outages

To achieve high availability, you must create redundant host connections and supply hosts with multi path drivers.

NOTE In the event of a front-end port failure or a director failure, hosts without redundant physical connectivity to a metro node cluster and without multi-pathing software installed could be susceptible to data unavailability.

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