How to obtain VMWare ESXi log and store it in our local machine?
Can it be acheived using VMWare powerCLI?
( I hope in log file i can get what are all the guest machines were utilized and how long . Is it true?)
Obtaining ESXi diagnostic logs can be done a couple different ways: Through the VI client, or through the API. The PowerCLI method is listed in the following KB article.
Regarding whether or not the guest machine utilization is in there, I'd need more info about what you are looking for.