This chapter covered the topics around monitoring the performance considerations for the vSphere environment. There was an overview of the disk I/O, which can have a negative impact on the virtual machines. We discussed what type of reports from vCenter can be used for pinpointing problems. There was a review of how vCenter uses Java, and how to change the configuration to obtain the best performance. The chapter covered the issue of performance data missing from vCenter on the host and how to resolve this problem by using different methods.

The next chapter will cover the troubleshooting of storage devices. Issues, such as deleting the virtual machine snapshot that has locked the files and is preventing the administrator from performing the cleanup, shall be discussed. It will also show how to un-mount an LUN from multiple the ESXi hosts. Using the vCenter Operations for troubleshooting other issues with the storage devices will be discussed.