Cross-Cloud Disaster Recovery: Building a Resilient Oracle DR Solution from AWS to Azure

A Tessell blog post describes a cross-cloud Oracle disaster-recovery design for an Oracle SE2 primary database on AWS and a standby on Azure, built to meet a 15-minute recovery point objective and one-hour recovery time objective without Data Guard or third-party replication software. The approach uses an IPSec site-to-site VPN between AWS and Azure, tightly scoped access for SSH and Oracle listener traffic, rsync jobs that ship Oracle archive logs every five minutes, and a continuously recovering standby database maintained in MOUNT state. It emphasizes that monitoring both archive-log apply lag and independent recovery heartbeats is necessary to detect silent replication failures, while failover requires activating the Azure standby and updating application connectivity; failback involves rebuilding AWS as a new standby. Tessell is presented as helping maintain consistent Oracle versions, patches, storage configurations, backups, point-in-time recovery, and inventory visibility across clouds, addressing configuration drift and logical-corruption risks that physical standby replication alone cannot prevent.

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