Book Image

VMware vSphere Troubleshooting

Book Image

VMware vSphere Troubleshooting

Overview of this book

VMware vSphere is the leading server virtualization platform with consistent management for virtual data centers. It enhances troubleshooting skills to diagnose and resolve day to day problems in your VMware vSphere infrastructure environment. This book will provide you practical hands-on knowledge of using different performance monitoring and troubleshooting tools to manage and troubleshoot the vSphere infrastructure. It begins by introducing systematic approach for troubleshooting different problems and show casing the troubleshooting techniques. You will be able to use the troubleshooting tools to monitor performance, and troubleshoot issues related to Hosts and Virtual Machines. Moving on, you will troubleshoot High Availability, storage I/O control problems, virtual LANS, and iSCSI, NFS, VMFS issues. By the end of this book, you will be able to analyze and solve advanced issues related to vShpere environment such as vcenter certificates, database problems, and different failed state errors.
Table of Contents (16 chapters)
VMware vSphere Troubleshooting
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Installing VMware vRealize Operations Manager
Power CLI - A Basic Reference
Index

vSphere HA


VMware vSphere HA protects virtual machines and vSphere hosts in a cluster by providing high availability. The vSphere HA agent monitors vSphere hosts and detects any failure occurring in the hosts. Once a vSphere host fails, vSphere HA restarts virtual machines to another available vSphere host. In a vSphere cluster, a host is elected as a master host by the vSphere HA agent and other hosts are elected as slaves. The master host monitors the slave hosts in the cluster and also monitors state of the virtual machines that are being protected by vSphere HA. The vSphere HA agent is installed on the vSphere host when it is added to a vSphere cluster.

The agent then communicates with the other vSphere agents that it finds in the cluster. A vSphere cluster can have a single vSphere host as a master, and the remaining vSphere hosts are slave hosts. If a vSphere master host fails, a reelection is held and a new master host is elected.