Fet Short Protection; Device Scsi Id; Hard Drive Activity Led; Table 13. Scsi Id Assignments - Intel SC5275-E Technical Product Specification

Appendix A: Chassis Spares and Accessories
Power control on the LVD SCSI backplane supports the following features.
1. Spin-down of a drive when failure is detected and reported (using enclosure services
messages) via the SCSI bus. An application or RAID controller detects a drive-related
problem that indicates a data risk. In response, it removes the drive from service and
sends a spin-down SCSI command to the drive. This decreases the likelihood that the
drive will be damaged during removal from the hot-swap drive bay. When a new drive
is inserted, the power control waits a small amount of time for the drive to be fully seated,
and then applies power with a controlled power ramp.
2. If the system power is on, the LVD SCSI backplane immediately powers off a drive slot
when it detects that a drive has been removed. This prevents possible damage to the
drive when it is partially removed and re-inserted while full power is available, and
disruption of the entire SCSI array from possible sags in supply voltage and resultant
current spikes.
6.2.2

FET Short Protection

The Field Effect Transistor (FET) short protection circuit is useful for protecting both the 12-V
and 5-V power control FETs located on the LVD SCSI backplane.
6.2.3

Device SCSI ID

Each device on a SCSI bus must have a unique SCSI ID. The 6 x 1.0-in LVD SCSI backplane
device SCSI ID is dependent on whether it is configured as a primary backplane.
6.2.4

Hard Drive Activity LED

Each SCSI hard drive turns on a green LED when it is accessed. The LEDs are 4-terminal dual-
color (yellow and green) and are physically located on the backplane.
Drive
1
2
3
4
26

Table 13. SCSI ID Assignments

Device
Drive 1
Drive 2
Drive 3
Drive 4
Drive 5
Drive 6
SAF-TE Controller

Table 14. Hard Drive Activity LED

HSBP LED Activated
1
2
3
4
Intel® Server Chassis SC5275-E TPS
SCSI ID as Primary Backplane
2
I C* connector (J2A1) pin1=1
0x0H
0x1H
0x2H
0x3H
0x4H
0x5H
0x8H (6 HDD)
LED Designator
TBD
TBD
TBD
TBD
LED Color
Green
Green
Green
Green
Revision 1.2