IBM Systems Journal

This paper introduces, at a high level, the key topics relevant to continuous availability of IBM systems infrastructures. After defining terms and identifying what is encompassed in the scope of continuous availability of IBM system infrastructures, we ...

IBM Parallel Sysplex® is a clustering technology that was designed to address specific client business objectives for IBM mainframe System z® servers. The nondisruptive addition of scalable processing capacity and improved application availability with ...

This paper surveys the current state of information technology (IT) availability on the IBM System p5® server platform, then describes how selected hardware and software features of the next-generation IBM Power™ Systems platform (by which we ...

In this paper, we describe continuously available services and application hosting on the Events/IBM.com® Infrastructure (EI)-a continuously available virtualized environment based on three active data centers that has demonstrated 100-percent ...

High-availability service management (HASM) is defined as information technology (IT) service management that is designed to meet the business demand for availability of critical IT and IT-enabled business services. HASM requires the use of the Six ...

This paper discusses high availability and disaster recovery solutions and their differences and presents the concepts and technical details of various solutions that combine them for highly critical environments. It discusses the business and ...

We present a brief introduction to three reliability engineering techniques: failure mode, effects, and criticality analysis; reliability block diagrams; and fault tree analysis. We demonstrate the use of one of these techniques, reliability block ...

Leveraging redundant resources is a common means of addressing availability requirements, but it often implies redundant costs as well. At the same time, virtualization technologies promise cost reduction through resource consolidation. Virtualization ...

We first provide an overview of the state-of-the-art architectures for continuous availability, briefly covering such traditional concepts as high-availability (HA) clustering on distributed platforms and on the mainframe. We explain how HA can be ...

The successful development and marketing of commercial high-availability systems requires the ability to evaluate the availability of systems. Specifically, one should be able to demonstrate that projected customer requirements are met, to identify ...

A common problem observed on mainframe installations, and one which presents a significant challenge for resiliency and high availability, involves soft failure incidents. In contrast to catastrophic failures, soft failures involve some degree of system ...

As the capacity of hardware systems has grown and workload consolidation has taken place, the volume of performance metrics and diagnostic data streams has outscaled the capability of people to handle these systems using traditional methods. As work of ...

Since the onset of the computer age, customers have been searching for ways to increase systems availability, maximizing the return on their investment and keeping their systems running continuously as much as possible. Traditionally, customers have ...

Designing and implementing a business resilience (or disaster recovery) plan is a complex procedure for customers, and the impact of implementing an incorrect or incomplete plan can be significant. For some customers, being able to recover their data ...

In this paper we examine the ways in which data center topology choices affect mission-critical business system availability and we propose a methodology for ensuring business resilience by assessing the risks to the mission-critical business systems ...