APC 15000 RAID manual Front Panel Drive Activity Indicators

Drive Enclosure

Locking Mechanism

Figure 5–7 DEM

Note The DEM is a serviceable PCB which may be replaced by trained personnel.

Each DEM connects to a single port of the HDD based on the location within the enclosure within which it is installed (Figure 5–8).Each provides power control signals to each drive slot. It controls HDD identify/service LEDs and monitors the status from partner DEM. Each pair set DEM supports 15 drives; there are 8 DEMs in a fully configured system.

Figure 5–8Drive Carrier and DEM Locations

5.4 Indicators

The drive enclosure has both FRU and status LEDs to indicate the state of various components within the enclosure. Each FRU has a visible BLUE identity LED. Each FRU, except the HDD, has a visible AMBER LED which indicates a fault.

Note In some components, the failure LED is internal to the enclosure and visible only when the cover is open.

The state of each LED within the enclosure is available through the in-band SES functionality at all times. The host can manually set the state of each LED through an in-band SES page.

5.4.1Front Panel Drive Activity Indicators

The Front Panel Drive Activity Indicators show the aggregated status of all the modules. This panel and its associated LEDs are shown in Figure 5–9.Drive activity LEDs flash during data I/O when transition

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