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

Multipathing and PSA troubleshooting


PSA is a collection of storage APIs used by a vSphere host using a VMkernel layer. PSA has different components, and its open and modular framework design allows an independent storage design for third-party SAN developers to directly interact with the storage I/O path of vSphere hosts.

PSA manages different plugins that perform different I/O operations, for example, synchronizing the concurrent I/O access, path selection, and load balancing can be defined by multiple multipathing plugins (MPPs), which can be provided by a SAN provider. The two most famous third-party MPPs are as follows:

The following screenshot presents PSA and depicts how third-party MPPs are plugged into it:

The multipath plugin can publish instructions to the vSphere storage I/O path directly. PSA not only loads and unloads these plugins within VMkernel, it also performs physical path scanning...