Intel SC5250-E User Manual
System Peripheral Bays
Intel® Entry Server Chassis SC5250-E
Revision
1.02
Intel order number C32881-001
24
5.5 SCSI
Interface
The SCSI interface on the server chassis SC5250-E
between the SCSI bus and the microcontroller (containing the intelligence for the server chassis
SC5250-E
SC5250-E
1
LVD/SE SCSI backplane). This interface allows the microcontroller to respond as a
SCSI target to implement the SAF-TE protocol.
Power control on the server chassis SC5250-E
1
LVD/SE SCSI backplane supports:
•
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.
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.
•
If the system power is on, the LVD/SE 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.
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.
5.6 FET Short Protection
The Field Effect Transistor (FET) short protection circuit is useful to protect both 12-volt and 5-
volt power control FETs located on LVD/SE SCSI backplane.
volt power control FETs located on LVD/SE SCSI backplane.
5.7 Device SCSI ID
Each device on a SCSI bus must have a unique SCSI ID. The 5 x 1.0” LVD/SE SCSI backplane
device SCSI ID is dependent on whether it is configured as a primary or a secondary backplane.
This configuration is defined by the logic of pin 1 on the I
device SCSI ID is dependent on whether it is configured as a primary or a secondary backplane.
This configuration is defined by the logic of pin 1 on the I
2
C connector (J2A1).
Note: The server chassis SC5250-E will only support a single backplane; therefore it will always
be identified as primary on the I
be identified as primary on the I
2
C bus.
Table 3. SCSI ID Assignments
Device
SCSI ID as Primary Backplane
I
2
C* connector (J2A1) pin1=1
SCSI ID as Secondary Backplane
I
2
C connector (J2A1) pin1=0
Drive 1
0x0H
0x8H
Drive 2
0x1H
0x9H
Drive 3
0x2H
0xAH
Drive 4
0x3H
0xBH
Drive 5
0x4H
0xCH
SAF-TE Controller
0x6H
0x5H
1
The SCSI backplane board set used for the server chassis SC5250-E chassis is the same as that which is used
used in the server chassis SC5100/SC5200 chassis.