Mainframe, MVS and zOS Discussion

Hi,

How to find CPU, memory and max users statistics for an LPAR? Are there some specific tools to do that or RMF is the only way to look for that? Please advise.

RMF is one way. Using the SMF records is a second way. Depending upon what, precisely, you want to know there are console commands that can be used for some of the information. If the LPAR has a monitor tool such as MXI or OMEGAMON or MAINVIEW installed, they typically can also provide this type of information.