<arg choice=plain><option><replaceable>host</replaceable></option></arg>
<arg choice=plain><option><replaceable>port</replaceable></option></arg>
<arg choice=plain><option><replaceable>nbd-device</replaceable></option></arg>
<arg choice=plain><option><replaceable>host</replaceable></option></arg>
<arg choice=plain><option><replaceable>port</replaceable></option></arg>
<arg choice=plain><option><replaceable>nbd-device</replaceable></option></arg>