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Dell SRDF Introduction

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Concurrent SRDF

Concurrent SRDF is a three-site disaster recovery configuration using an R11 device that replicates to two R2 devices. The two R2 devices operate independently but concurrently using any combination of SRDF modes:

  • Concurrent SRDF/S to both R2 devices if the R11 site is within synchronous distance of the two R2 sites
  • Concurrent SRDF/A to sites at extended distances from the workload site

Either of the R2 devices can restore data to the R11 device. Similarly, an R2 device can restore both the R11 and the other R2 device.

Concurrent SRDF can also replace an existing R11 or R2 device with a new device. Migrate data from the existing device to a new device using adaptive copy disk mode, and then replace the existing device with the newly populated device.

Concurrent SRDF topologies use Fibre Channel and Gigabit Ethernet.

This example shows:

  • The R11 -> R2 in Site B in synchronous mode
  • The R11 -> R2 in Site C in adaptive copy mode
Figure 1. Concurrent SRDF topology
Concurrent SRDF topology

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