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Dell SRDF Introduction

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Unplanned failover

An unplanned failover moves production applications from the primary site to the secondary site after an unanticipated outage at the primary site.

Failover to the secondary site in a simple configuration can be performed in minutes. You can resume production processing when the applications are restarted on the failover host that is connected to Site B.

Unlike the planned failover operation, an unplanned failover resumes production at the secondary site, but without remote mirroring until Site A becomes operational and ready for a failback operation.

This diagram shows failover to the secondary site after the primary site fails.

Figure 1. Failover to Site B, Site A and production host unavailable.
Failover to Site B, Site A and production host unavailable.

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