Disk Drive Drawer printed circuit board (PCB) assemblies
Each disk drive drawer in a 5U84 storage shelf uses a printed circuit board (PCB) assembly to provide the electrical connectivity to the drawer's disk drives.
Along with providing the electrical connectivity to the disk drives, PCB assemblies also provide:
Mounting platforms for the drawer cabling system
Redundant power paths to each disk drive
Redundant 12Gb/s SAS signal paths to each disk drive
Provide technical feedback to the system when a drawer is opened or closed.
PCB assemblies include the following components:
Three drawer Baseplane cards
One right side Drawer Sideplane card
One left side Drawer Sideplane card
Table: Disk drive drawer PCB assembly components
Label | Item |
|---|---|
A | Drawer Sideplane card (left) |
B | Drawer Sideplane card (right) |
C | Baseplane card |
Each PCB assembly contains two Drawer Sideplane cards. One Sideplane card mounts on the right side of the disk drawer, while the other card mounts on the left side of the drawer.
Drawer Sideplane cards provide power paths to the drawer Baseplanes and the DDICs and their installed disk drives. Sideplane cards also provide 12Gb/s SAS connections.
Sideplane cards are hot swappable and replaceable by service personnel while the storage shelf is running in a rack.
Note:
Removing the Sideplane upper metal cover removes power to the Sideplane, which enables the faulty Sideplane to be hot-swapped.
Three Drawer Baseplanes comprise each PCB assembly. Drawer Baseplanes provide a dual path for 12Gb/s SAS connectivity between the Drawer Sideplane cards and the DDICs. They also provide power to the DDICs from either the right or the left Drawer Sideplane cards.
The Drawer Baseplanes also provide four remote temperature sensing diodes that monitor disk drive temperatures within the disk drive drawers.
