APC 15000 RAID User Manual
Drive Enclosure
007-5510-002
101
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 (
it is installed (
). 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.
there are 8 DEMs in a fully configured system.
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.
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.
times. The host can manually set the state of each LED through an in-band SES page.
5.4.1
Front 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
its associated LEDs are shown in
. Drive activity LEDs flash during data I/O when transition
Figure 5–7
DEM
Locking Mechanism
Figure 5–8
Drive Carrier and DEM Locations