HP Surestore Disk Array 12h - And FC60, Advanced User'S Manual, Page: 25 / 466

Disk Enclosure Components
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Operation Features
The disk enclosure is designed to be installed in a standard 19-inch rack and occupies 3.5
EIA units (high). Disk drives mount in the front of the enclosure. Also located in the front
of the enclosure are a power switch and status LEDs. A lockable front door shields RFI and
restricts access to the disk drives and power button (
Figure 3 on page 26 ).
BCCs are installed in the back of the enclosure along with redundant power supplies and
fans.
Status Indicators
LEDs on the front and back of the disk enclosure enable you to quickly identify and replace
failed components, thereby preventing or minimizing downtime.
"Troubleshooting" on
page 359 provides more detailed information about the operation of these LEDs.
Two system LEDs on the front, top right corner of the disk enclosure (A in Figure 3 )
indicate the status of the disk enclosure. The left LED indicates when power is on or off
and the right LED identifies if a fault has occurred. Additional pairs of LEDs above each
disk slot (D in
Figure 3 ), indicate disk activity and a fault condition. The left LED (green)
indicates disk I/O activity and the right LED goes on if the disk module has experienced a
fault. The disk fault LEDs are also used by the management tools to identify a specific disk
module by flashing its fault LED.
On the back of the disk enclosure, the following LEDs (
K
) indicate the status of replaceable
components and Fibre Channel link:
– Power supply status and fault LEDs
– Fan status and fault LEDs
Bus Controller Card LEDs:
– BCC Fault LED
– Term Power LED (monitors power on the SCSI bus)
– Full Bus Mode LED
– LVD Mode LED
– Bus Free Status LED
For detailed information on LED operation, refer to "Troubleshooting" on page 359