The SAP transaction OS07N, the Operating System Monitor, is the correct tool for this task. It provides detailed, real-time, and historical data about the underlying operating system's hardware resource consumption. This includes critical metrics for migration sizing, such as CPU utilization, physical and virtual memory usage, disk I/O, and network statistics. Analyzing this data from the source system is a fundamental step in accurately sizing the target virtual machines in Azure to ensure performance and cost-effectiveness for the migrated SAP workload.

A. SM51: This transaction is used to list and manage the active SAP application server instances within a system, not for monitoring detailed OS-level hardware metrics.

B. DB01: This is a database-specific transaction used to analyze exclusive database lock waits. It does not provide information about OS hardware usage like CPU or memory.

C. DB12: This is a database administration transaction used to display logs and the status of database backups and recovery operations, not for OS performance monitoring.

1. SAP Help Portal

Operating System Monitor (OS07N): "You can use the operating system monitor to check the status of the operating systems of the servers in your system landscape. It displays data such as CPU utilization

memory consumption

and disk and network information." This directly confirms the function of OS07N.

Source: SAP Help Portal

Document: Operating System Monitor.

2. Microsoft Learn

SAP workload planning and deployment checklist: "Size the Azure VMs that will host the SAP application layer and the DBMS layer. For existing SAP systems

SAP provides tools that can help you determine the current resource consumption of your SAP systems." OS07N is a primary SAP tool for gathering this resource consumption data.

Source: Microsoft Learn

Module: Plan for SAP workloads on Azure

Unit: SAP workload planning and deployment checklist.

3. SAP Help Portal

CCMS: System/Server Status (SM51): "This transaction allows you to get an overview of the SAP servers (instances) and to manage them." This confirms SM51 is for managing SAP instances

not OS monitoring.

Source: SAP Help Portal

Document: Displaying and Controlling Servers.