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

LUN and claim rules


To identify disk volumes in a storage array, a LUN is used. For simplicity, LUN is a logical volume that acts for a disk volume on SAN called target. LUNs can be single or in multiples for a single given disk volume or target, depending on the storage provider and the storage configuration for vSphere hosts. LUNs are represented by an integer assigned by a storage array. A single vSphere host can have up to 256 SCSI storage devices or LUNs starting from zero to 255 in older vSphere hosts. Starting from vSphere 6.0, a host can have 1,024 SCSI storage devices ranging from zero to 1,023. While targets are represented by unique names, for example, iSCSI names are used for iSCSI targets and World Wide Names (WWN) are used for FC.

You can configure the maximum LUN ID in the Advanced Settings by changing Disk.MaxLUN. In earlier vSphere hosts, it was set to 256 by default, and in vSphere 6.0, to 1024.

To configure Disk.MaxLUN, follow this procedure:

  1. Go to Advanced System Settings...