Using Z Vm V 6 2 Single System Image Ssi And Live Guest Relocation Lgr
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Using z/VM v 6.2 Single System Image (SSI) and Live Guest Relocation (LGR)
In this IBM® Redbooks® publication, we expand upon the concepts and experiences described in "An introduction to z/VM Single System Image (SSI) and Live Guest Relocation (LGR)", SG24-8006. An overview of that book is provided in Chapter 1, "Overview of SSI and LGR" on page 1. In writing this book, we re-used the same lab environment used in the first book, but expanded it to include IBM DB2® v10 on Linux on System z®, two IBM WebSphere® Application Server environments, and added a WebSphere application, used for performance benchmarking, which provided a workload that allowed us to observe the performance of the WebSphere Application Server during relocation of the z/VM® 6.2 member that was hosting the application server. Additionally, this book examines the use of small computer system interface (SCSI) disks in the z/VM v6.2 environment and the results of using single system images (SSI) and live guest relocation (LGR) in this type of environment. In the previous book, a detailed explanation of relocation domains was provided. In this book, we expand that discussion and provide use cases of relocation domains in different situations. Finally, because the ability to back up and restore your data is of paramount importance, we have provided a discussion about how to use one tool, the IBM Backup and Restore Manager for z/VM, which can be used in the new z/VM6.2 environment. We provide a brief overview of the tool and describe the changes in the installation process as a result of using single system image clusters. We also demonstrate how to set up the configuration file, and how to back up and restore both a user and an identity. This publication is intended for IT architects who will be responsible for designing the system and IT specialists who will have to build the system.
An Introduction to z/VM Single System Image (SSI) and Live Guest Relocation (LGR)
IBM® z/VM® 6.2 introduces significant changes to z/VM in the form of multi-system clustering technology allowing up to four z/VM instances in a single system image (SSI) cluster. This technology is important, because it offers clients an attractive alternative to vertical growth by adding new z/VM systems. In the past, this capability required duplicate efforts to install, maintain, and manage each system. With SSI, these duplicate efforts are reduced or eliminated. Support for live guest relocation (LGR) allows you to move Linux virtual servers without disruption to the business, helping you to avoid planned outages. The z/VM systems are aware of each other and can take advantage of their combined resources. LGR enables clients to avoid loss of service due to planned outages by relocating guests from a system requiring maintenance to a system that remains active during the maintenance period. Together, the SSI and LGR technologies offer substantial client value, and they are a major departure from past z/VM practices. This IBM Redbooks® publication gives you a broad understanding of the new SSI architecture and an overview of LGR. We show an LGR example that shows a typical SAP user environment. In our example, the SAP Application Server Central Instance resides on a Linux on System z® guest and an IBM DB2® 10 database server runs on z/OS®. This book is written for IT architects, who design the systems, and IT specialists, who build the systems.
DB2 10 for Linux on System z Using z/VM v6.2, Single System Image Clusters and Live Guest Relocation
IBM® z/VM® 6.2 introduced significant changes to z/VM with a multi-system clustering technology that allows up to four z/VM instances in a single system image (SSI) cluster. This technology is important because it offers you an attractive alternative to vertical growth by adding new z/VM systems. In the past, this capability required duplicate efforts to install, maintain, and manage each system. With SSI, these duplicate efforts are reduced or eliminated. Support for live guest relocation (LGR) allows you to move Linux virtual servers without disrupting your business or incurring loss of service, thus reducing planned outages. The z/VM systems are aware of each other and take advantage of their combined resources. LGR enables you to relocate guests from a system requiring maintenance to a system that will remain active during maintenance. A major advantage for DB2 v10 customers is that using z/VM 6.2 does not require any changes to existing DB2 structures. This remarkable benefit is due to the fact that DB2 v10 is installed as part of the LInux guest on z/VM and is fully integrated into LGR. This allows you to smoothly move DB2 v10 when you move Linux virtual servers, without interrupting either DB2 v10 or z/VM operations and services. This IBM Redbooks® publication will help you understand how DB2 10 on Linux for System z® behaves while running on a z/VM that is being relocated using z/VM's 6.2 Live Guest Relocation feature. In this book, we explore memory management, the DB2 Self-tuning memory manager feature, time synchronization, networking, and storage and performance considerations with regards to relocation. We also offer some best practices found during a live guest relocation for DB2 v10.