Servers need to install SQL 2012, because of the need to install .net3.5, did not think 2012 for security but not letting manual installation, but also to control the source files are quite strict, toss a while to solve the problem
There are only about powershell parameters such as installation commands have failed. Using the installation package does not allow installation, use only the original source disk in the package to install.
Server version: Windows 2012 R2 X64
Installer Version: .net3.5
A, open Server Manager, dashboards
Click Add Roles and Functions
Second, next, next, next, next, they are by default more
Third, select Add .net3.5 function
Fourth, specify the original installation disk up, the system will be loaded into the CD-ROM
V. This is in the D position, input source path
D: \ SOURCES \ SXS \ OK
Successful installation
carry out.