Enabling drain mode on an Azure Virtual Desktop session host is the correct procedure for preparing it for maintenance. This setting prevents the host from accepting any new user connections. However, it does not forcefully disconnect users who are already connected. Active sessions will remain until the users sign out, their session is disconnected by an administrator, or an idle/disconnect policy takes effect. This allows for a graceful shutdown of the session host, fulfilling the stated goal.

B. No: This is incorrect because drain mode is the specific feature designed within Azure Virtual Desktop to prevent new sessions on a host while allowing existing sessions to continue, which is the exact requirement for performing maintenance without disrupting active users.

1. Microsoft Learn. (2023). Session host drain mode - Azure Virtual Desktop. In the section "What is drain mode?"

it states

"Drain mode prevents new user sessions from logging on to the session host. This lets you gracefully shut down session hosts before maintenance. This won't affect any currently connected user sessions."

2. Microsoft Learn. (2023). Manage session hosts - Azure Virtual Desktop. Under the section "Set a session host's drain mode

" the documentation details the process: "To turn on drain mode... set Allow new sessions to No." This confirms the action and its effect of preventing new logons.