A computer implemented method monitors resource usage of a virtual machine. The toner cartridge includes: a toner bottle air-tightly storing a toner; a first shutter sliding in a longitudinal direction of the toner bottle; and a second shutter sliding in a circumferential direction of the toner bottle to open and close a toner outlet. The first attachment member, attached to the multi-lumen tube, includes first ports having an outer diameter substantially the same a lumen opening diameter at the end portion of the multi-lumen tube to fit into the lumen openings, and a first cutout corresponding to one of the lumen openings. The power supplied to the LED is controlled corresponding to the averaged error signal SerrA.