Enabling versioning and multi-factor authentication (MFA) on the S3 bucket will prevent accidental deletion while still allowing necessary deletions. Versioning allows for the preservation and retrieval of multiple versions of an object, ensuring that even if a backup file is accidentally deleted, it can be restored from a previous version. Multi-factor authentication (MFA) adds an additional layer of security, requiring users to provide two forms of authentication, which reduces the risk of accidental or unauthorized deletions.
To achieve high availability within the eu-central-1 region and disaster recovery in the eu-west-1 region, it is necessary to configure SAP HANA system replication correctly. For high availability within the same region (eu-central-1), SYNC or SYNCMEM replication mode is appropriate as both can handle less than 1 ms latency effectively. ASYNC replication mode is suitable for disaster recovery across regions (eu-west-1), considering the inter-region latency is greater than 1 ms. Option B sets up the primary system in one availability zone and the secondary system in another within the eu-central-1 region using SYNC replication, and uses ASYNC replication for the DR system in eu-west-1, ensuring both high availability and effective DR. Option E, similarly, uses SYNCMEM mode for the internal region replication and ASYNC for cross-region DR setup. These configurations align perfectly with the prerequisites and requirements.
The UploadChannelSize parameter in the AWS Backint agent configuration file determines how many files can be uploaded in parallel during backups. Increasing this value will allow more files to be uploaded simultaneously, thereby reducing the overall time required for the backup process. This directly addresses the issue of long-running database backups by optimizing the upload performance. Ensuring proper configuration based on the EC2 instance type and storage configurations is crucial for achieving optimal backup performance.
The migration solution utilizing SAP HANA system replication for SAP S/4HANA and SAP BW/4HANA is the most appropriate for minimizing downtime. SAP HANA system replication ensures continuous data synchronization between the source system and the target AWS system, facilitating a smooth switch-over with minimal disruption. Performing a system export/import using SAP Software Provisioning Manager for SAP Solution Manager, and reinstalling SAP Web Dispatcher on AWS with the necessary configuration, addresses the other migration requirements comprehensively.
To migrate the SAP system most quickly, the company should use Cross Platform Transportable Tablespace (XTTS) conversion on the Oracle database. This method involves creating a staging Oracle database on premises to perform the XTTS conversion, taking a backup of the converted staging database, and copying it to AWS through the Direct Connect connection. Regularly scheduled incremental backups and XTTS conversions of the staging database should also be taken and transferred to AWS. During the migration window, a final incremental Oracle backup should be performed, converted using XTTS, and the logs replayed in the target Oracle database hosted on AWS. This approach allows for a smooth and efficient migration with minimal downtime, making it the quickest solution.