Item Name Icon Description1 System identificationbuttonThe system identification button on the front control panel can be used tolocate a particular expansion enclosure within a rack. When the button ispressed, the system status indicators on the control panel and theEnclosure Management Module (EMM) blink blue until the button ispressed again.2 Power LED The power LED lights when at least one power supply unit is supplyingpower to the expansion enclosure.3 Expansion enclosure statusLEDThe expansion enclosure status LED lights when the expansion enclosurepower is on.• Solid blue during normal operation.• Blinks blue when a host server is identifying the expansion enclosure orwhen the system identification button is pressed.• Blinks amber or remains solid amber for a few seconds and then turnsoff when the EMMs are starting or resetting.• Blinks amber for an extended time when the expansion enclosure is ina warning state.• Remains solid amber when the expansion enclosure is in the fault state.4 Hard disk drives • SCv300 – Up to 12 3.5-inch SAS hot-swappable hard disk drives.• SCv320 – Up to 24 2.5-inch SAS hot-swappable hard disk drives.SCv300 and SCv320 Expansion Enclosure Back-Panel Features andIndicatorsThe back panel provides controls to power up and reset the expansion enclosure, indicators to show the expansion enclosure status,and connections for back-end cabling.Figure 3. SCv300 and SCv320 Expansion Enclosure Back Panel Features and IndicatorsItem Name Description1 Power supply unit and cooling fanmodule (PS1)600 W power supply2 Enclosure management module(EMM 0)The EMM provides a data path between the expansion enclosure and thestorage controllers. The EMM also provides the management functions forthe expansion enclosure.3 Enclosure management module(EMM 1)The EMM provides a data path between the expansion enclosure and thestorage controllers. The EMM also provides the management functions forthe expansion enclosure.4 Information tag A slide-out label panel that records system information such as the ServiceTag6