This is the 6032nd most frequent Korean word.
서버를
"서버를" means "server" (as the object of a verb) in English.
In this sentence, '서버를' is used as the direct object being affected by the action, which is '재부팅' (rebooting).
서버를 재부팅해야 합니다.
We need to reboot the server.
Here, '서버를' indicates the direct object being the focus of the action - '관리하는 일' (managing work).
서버를 관리하는 일이 쉽지 않습니다.
Managing the server is not easy.
In this context, '서버를' acts as the direct object receiving the action '최적화하는' (optimizing).