To monitor disk-usage, memory usage and cpu usage with Splunk use the technology add-ons (TAs) from Splunkbase appropriate for your server - https://splunkbase.splunk.com/app/742/ (for windows) and https://splunkbase.splunk.com/app/833/ (for *nix/ Linux).
Follow the documentation provided with the TAs to install and configure your inputs. I
Hope this helps ...
I read some document I get to know that I have to install the Splunk TA for Unix and Linux on forwarder (in my case on Linux) and splunk app forunix on windows(receiver) I don't know how to install TA for Unix and Linux on forwarder and configure it and how to configure splunk app which is installed on windows to see the cpu memory and disk usage.
Plz correct me if Its not the required step