SAS Disk Drives
There are four SAS disk drive slots on the BL870c server blade. The SAS disk drives have identical
LEDs that show the drive status and activity.
Figure 3 shows the slot numbers of the SAS hard disk drives.
Figure 3 SAS Disk Drive Slots
431
SAS disk drive slot 1 SAS disk drive slot 4SAS disk drive slot 3
2
SAS disk drive slot 2
SAS Backplane
The SAS disk backplane supports four small form factor (SFF) 2.5 inch hard drives. The SAS
backplane supports hot-plugging a single SAS drive at a time. A preprogrammed system-on-chip
(PSOC) controls the SAS disk drive activity and status LEDs. The system board hosts the SAS
controller, and supplies 12 V, 5 V, and 3.3 V standby power to the SAS backplane. The SAS
backplane is a field-replaceable unit.
The SAS backplane is connected to the system board with a straight connector. Power, Sense, and
I
2
C signals are routed through this connector as well as the serial general purpose input/output
(SGPIO) signals.
16 Overview
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