Pull the SCCM Servers list from SCCM Central Database or refer the SCCM Design documents to get the Site servers list.
Select Computer Management -> Right Click -> Run as Administrator -> Click.
Also read: How to review sccm site boundaries and OU mapping details?
Select Computer management -> Right Click -> Select Connect to another computer -> Click.
Select the Server name and click OK.
Expand Disk Management -> See the Disk space size information on right side.
Hope this will be helpful.