i would start out by looking at documentation here:

Home > Support > Technical Documentation and Advisories > Software ~ C ~ Documentation > ControlCenter

There's also a great training available called "Symmetrix Performance Workshop". You can find it on http://education.emc.com/part/training/find_training.aspx

Since you are asking about WLA assuming you have and use the ECC console as well.

Under the Help menu click on Documentation Library and you will find a section called Performance Manager which (at least for version 6.0 of ECC) has a Tutorial and Glossary of performance metrics.

The Tutorial document is probably exactly what you are after.

Yes, I have checked it. But when people talk about WLA they say about MBs of raw data which it creates. I did not find those repository details any where

If you go to the "Agent" view in ECC and drop the host running the "WLA Archiver" agent it should list a variable called "WLA Archiver Path" which will point you to the directory on the server running the WLA agent where the files are stored.

To get any performance statistics you need the following:

1) A Performance Manager license installed.
2) An active "WLA Archiver" agent.
3) Enable WLA_Daily (or other) policies for the Agents you want to collect data. This is described per Agent type (Symmetrix, Host, etc.) in the ECC installation guide.
4) Install the Performance Manager client on a server or PC to access the data.

Hopefully that helps a little bit more - you need the Performance Manager to be able to view this data as it is stored in a binary format.

Thanks Bodnarg. I am going to check it out.

Cool.. I got the path ...