The most effective method to minimize costs for non-production environments like development and quality assurance is to shut them down during periods of inactivity, such as nights and weekends. Azure Automation runbooks provide a robust and schedulable mechanism to automatically stop (deallocate) and start Azure virtual machines. When a VM is deallocated, Azure stops billing for compute resources (CPU, memory), resulting in significant cost savings. This approach directly addresses the requirement by ensuring the SAP landscapes are only running and incurring costs when they are actively being used.

B. The stopsap command stops the SAP application services running within the OS but does not deallocate the Azure VM, so compute costs continue to accrue.

C. Azure App Service is a Platform-as-a-Service (PaaS) offering and is not used to host the core components of an SAP NetWeaver or S/4HANA environment.

D. Azure Virtual Machine Scale Sets are designed for automatic scaling of identical VMs based on performance metrics, not for scheduled shutdowns of entire landscapes.

1. Microsoft Learn

"Start/Stop VMs v2 overview": This document describes a feature built on Azure Automation specifically for cost optimization. It states

"The Start/Stop VMs v2 feature starts or stops enabled Azure VMs on a schedule. It helps optimize costs for users who want to stop VMs when not in use and then start them when they're needed." This directly supports using automation for the described scenario.

2. Microsoft Docs

"Azure Virtual Machines planning and implementation for SAP NetWeaver"

Section: "General Azure VM deployment": This guide

while not explicitly detailing automation

establishes the foundation that SAP landscapes run on IaaS VMs. The principle of deallocating IaaS VMs to save costs is a fundamental Azure best practice. The document notes

"For non-production systems

you can reduce costs by shutting down the SAP systems and deallocating the VMs." Azure Automation is the primary tool to schedule this deallocation.

3. Microsoft Docs

"Virtual machine states and billing status": This document clarifies that billing for compute resources stops only when a VM is in the Stopped (deallocated) state. This confirms why simply running stopsap (Option B)

which leaves the VM in a Running state

does not save on compute costs

whereas using an automation runbook to deallocate the VM (Option A) does.