Key Components of ESAP Technical Platform

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2.3.2. Key components of ESAP technical platform

The 5 key components of the new platform for ESAP applications are described below. All together, these components enable the delivery of much more flexible, resilient, highly scalable and performant infrastructure that can support ESAP and other applications with substantially decreased TCO.

2.3.2.1. 64-bit Linux

Linux is commonly recognised as a most cost-effective Open Source operating system for business-critical applications. This platform allows to directly address the large memory, facilitating the consolidation of non-production (development and test) application instances with very low CPU consumption but relatively high memory utilisation without using special and rather expensive server virtualisation software. Linux platform is sufficiently mature, it is less vulnerable to the security threats than Windows, and allows to use SAP Adaptive Computing (see item 5) that is not fully supported on Windows platform. Finally, Linux has native support for NFS protocol, which is crucial to enable the efficient use of NAS. This is a key factor driving the choice of Linux platform instead of competing MS Windows. It allows using NAS directly connected to the Linux servers without iSCSI overhead that would be non-avoidable in the case if Windows platform was used.

2.3.2.2. AMD Opteron

Despite Linux can perfectly run on 64-bit Intel servers as well, AMD provides better performance/cost ratio and is more mature platform for 64-bit computing. Linux on AMD is fully certified by SAP platform for SAP applications. ESAP runs on 64-bit Red Hat Enterprise Linux 4.0 Update 5.

2.3.2.3. Oracle Real Application Clusters (RAC)

Oracle RAC is the database clustering solution which can run on commodity platform without any special requirements to the hardware or operating system software. All the nodes of cluster are operating concurrently with automatic load balancing. The load is automatically redistributed without database services outage in the case of the cluster node failure or the new node introduction. This ensures high resilience and virtually unlimited horizontal scalability of the database layer using small cheap unified commodity servers. Oracle RAC is fully certified by SAP as a DB platform for SAP applications.

2.3.2.4. NetApp storage

NetApp provides fully certified by SAP and Oracle NAS solution which can not be treated as a commodity, but is very widely used for business-critical applications and has some unique features not available from any other storage vendor. Particularly, FlexClone allows sharing the copy of production DB between several non-production instances. This copy may be represented by maintained in the real-time at the failover site remote replica of the production DB, making the DR almost instant (realistically, within 3 hours if dedicated DR hardware is not available and failover happens to the non-production processing environment).

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