[MSSQL] Mirroring, 미러링

https://msdn.microsoft.com/en-us/library/ms175191.aspx

* Summary

1. Prepare

  - Main Server: Another IP Address on Physical

  - Mirror Server: Another IP Address on Physical

  - Witness Server: Another IP Address on Physical

2. Configure

 1) 포트 설정

  - Main Server: example set port, 5022

  - Mirror Server: example set port, 5023

  - Witness Server: example set port, 5024

 2) Startup

  - Main Server: 2nd Startup

  - Mirror Server: 1st Startup

  - Witness Server: 3rd Startup