Specifications

QSSC-S4R Technical Product Specification Hot Swap Backplane (HSBP)

8.2.5 Vitesse* VSC410 Controller Functionality

The Vitesse* VSC410 is a storage management controller with SCSI Accessed Fault-Tolerant Enclosure (SAF-TE) and

SCSI enclosure services (SES). The figure below shows the Vitesse* VSC410 internal logic and external interfaces.

Note that you need a SES I2C* cable which plugs into the SAS backplane/HSBP and the SAS adapter, in order to use

the SES functions. This communication can also be accomplished via the SGPIO interfaces.

Figure 25. VSC410 Block Diagram

8.2.5.1 SPI Flash

Firmware for the Vitesse* VSC410 storage management controller is stored in an 8-Megabit (Mb) SPI Flash memory

device. Each Flash device can be updated via the Intelligent Platform Management Bus (IPMB) bus.

8.2.6 SAS Drive Functionality

The Hot-Swap Backplane provides connections for a maximum of eight SAS drives. Each drive can be inserted and

removed while the system is powered-on and automatic detection and rate negotiation are performed after each

insertion. The Hot-swap Backplane provides +5V and +12V to each drive connector and supports in-rush current

limiting to 300mA during hot swapping.

8.2.7 Power Control Interlock

The power control interlock is part of the SAS specification. This prevents drives from powering on at the same time.

Since only one drive can power on at once the board power requirements can be kept lower.

8.2.7.1 System Status Notification

Internal SAS drive status information is collected by the Vitesse* VSC410 storage management controller. The

information can be monitored by accessing the VSC410’s serial port. Output drive strength and input pre-emphasis

may also be controlled via the serial port. In addition, any drive data can be routed to the server management via the

IPMB.

8.2.7.2 SAS Status LEDs

The status LEDs gives the user a visual indication of the drives’ condition. There is a single green LED (activity –

down) and a single amber LED (fault – up) for each drive. The LEDs use a combination of color and blinking frequency

to indicate multiple conditions.

The hard drive status LEDs are located on the Hot-swap Backplane and projected out the front of the carrier via light

pipes. The states of the LEDs are described in Table 13. HDD LED Indication and Table 14. 8X HDD Activity LED

Functionality on the HSBP.