     constructor: (@gcloud, @name, @zone=DEFAULT_ZONE) ->
         @_vm = @gcloud._gce.zone(@zone).vm(@name)
 
-    dbg: (f) -> @gcloud.dbg("vm.#{f}")
+    dbg: (f) -> @gcloud.dbg("vm(name='#{@name}').#{f}")
 
     show: =>
         @get_metadata(cb:console.log)

                            cb : (err) =>
                                dbg("result of start -- #{err}")
        setInterval(check, opts.interval_s*1000)

class Disk
    constructor: (@gcloud, @name, @zone=DEFAULT_ZONE) ->

            type      : undefined  # 'pd-standard' or 'pd-ssd'; if not given same as current
            zone      : undefined
            cb        : required
        dbg = @dbg("change()")
        dbg(misc.to_json(misc.copy_without(opts, ['cb'])))
        if not opts.size_GB? and not opts.type? and not opts.zone?
            dbg("nothing to do")
            opts.cb()
