Hi HongWei,
You can follow the steps in the article you quoted.
The special thing on a 2000 Series is that head and Harddirves share a chassis, so you maybe don´t have a external shelf.
I this case you can power off the hole chassis after a gracefull shutdown with "halt". If you do have an external shelf attached,
shut the system down ("halt"), then first poweroff the external shelf and then the FAS2000.
When you want to restart the system do it in reverse order: poweron the shelf(s) wait abaout 30 Seconds for the shelf(s) to come up,
then boot the FAS2000.
Rob