A company is going to upgrade a SAP HANA solution.

Sizing a storage solution for SAP HANA is fundamentally different from sizing general-purpose virtualization workloads. SAP HANA is an in-memory database, but it has extremely strict requirements for the underlying persistent storage layer to ensure data integrity during savepoints and log writes. SAP enforces these requirements through the SAP HANA Tailored Data Center Integration (TDI) program.

To begin the sizing process and ensure the solution will pass the SAP Hardware Configuration Check Tool (HWCCT) or the newer SAP HANA System Check, a storage architect must first determine the required IOPS rate, specifically for the /hana/data and /hana/log volumes. SAP provides specific KPIs for latency and throughput that must be met. For instance, the log volume requires extremely low-latency writes to handle the sequential redo logs, while the data volume requires high-throughput (MB/s) and specific IOPS to handle asynchronous savepoints.

While the number of nodes (Option C) and replication features (Option D) are important for the overall architecture, they do not dictate the "right-sizing" of the storage performance tier in the same way the IOPS and throughput requirements do. If the storage cannot meet the SAP-certified IOPS and latency thresholds, the entire solution will be unsupported, regardless of how many nodes are present. By identifying the IOPS and throughput needs first, the architect can determine if the customer requires an All-Flash Alletra 9000 or if an Alletra MP configuration with specific drive counts is necessary to provide the required "parallelism" to hit SAP's performance targets.