The hard drives in the server are hot-pluggable, but this capability depends on how the hard drives are configured. To hot-plug a drive you must be able to take the drive offline before you can remove it. Prevent any applications from accessing the drive and remove the logical software links to it.
The following situations inhibit the ability to perform hot-plugging of a drive:
The hard drive provides the operating system, and the operating system is not mirrored on another drive.
The hard drive cannot be logically isolated from the online operations of the server.
If your drive falls into one of these conditions, you must shut the system down before you replace the hard drive. See Power Off the Server.