Techdocs Library > White papers > Capacity on Demand: 2 – 4 Way Systems Dynamic LPAR Examples for SAP

Document Author: Additional Author(s):	Mark Gordon Phil Hardy		Document ID:	WP100369
Doc. Organization:	BI/ERP Solutions Center		Document Revised:	11/03/2003
Product(s) covered:	SAP

Abstract: Dynamic LPAR (DLPAR) enables one to make dynamic processor and memory configuration changes in an LPAR. The ability to dynamically modify the number of CPUs as well as available memory can offer benefits in being able to quickly manage resources and respond to changing processing requirements. This paper documents the results of testing DLPAR to modify processor and memory resources in an SAP R/3 workload. The objective was two fold: · Illustrate workload scalability by adding processors and memory to an LPAR; and, · Illustrate that the DLPAR changes do not disrupt the running workload. In summary, resource requirements can be changed as necessary - it is a straightforward process, and occurs without having to recycle either a system from which resources are removed, or a system to which the resources are added. This reduces the pressure to configure the processor and memory requirements for each LPAR for the heaviest peak processing loads – systems can be configured more to the point of addressing overall system processing loads, with the knowledge that resources can be reallocated to an LPAR when its peak period processing is required, by moving resources from LPARs that don’t need them.

Classification:	Solutions	Category:	Operational Management
Solution(s):	Enterprise Application Solutions (EAS/ERP)
Platform(s):	IBM System p Family
O/S:	AIX	Keywords:	DLPAR, Capacity on Demand, Dynamic LPAR , Dynamic Resource Allocation, SAP