Quick Hardware Setup Guide

Step 6: Connect SCSI Devices to MegaRAID Controller

External

Very-High

Density

SCSI

Connectors

J4 J5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Channel 1

 

J18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Internal High-Density

SCSI Connectors

J2

J3

Channel 0

Channel 1

J10

DIMM Socket

J16

Connect SCSI devices to the internal high-density 68-pin SCSI connectors and/or the external very high-density 68-pin SCSI connectors. To achieve maximum data throughput, use only Ultra320 SCSI devices. The MegaRAID SCSI 320-2 Controller supports up to 15 Ultra320 devices per channel at a maximum SCSI bus cable length of 12 m. You can also connect Ultra160 and Ultra2 SCSI devices. The MegaRAID SCSI 320-2 Hardware Guide lists the maximum number of devices and maximum cable length for each kind of SCSI device.

Disable SCSI termination on all devices that are not connected at the end of the SCSI bus. Use only high-quality ribbon SCSI cables for internal devices and high-quality round SCSI cables for external devices. If you are connecting both SCSI disk drives and other kinds of SCSI devices such as CD-ROM drives, we recommend that you connect the disk drives on one SCSI channel and the other devices on the other channel.

Step 7: Set Target IDs for SCSI Devices

Step 4: Install Battery Backup Pack

The battery backup pack on the MegaRAID controller provides 72 hours of data retention in the event of a power failure. The MegaRAID SCSI 320-2 Controller normally includes a battery backup pack as a standard feature.

If you need to install a battery pack on the MegaRAID controller, you can screw the battery to the board through the backside of the board, using the three holes in the board. Connect the three wires from the battery pack to J10, the battery pack connector. The new battery pack must then be configured with the MegaRAID BIOS setup program. See the MegaRAID SCSI 320-2 Hardware Guide for more information.

Step 5: Install MegaRAID SCSI 320-2 Controller

Install the MegaRAID SCSI 320-2 Controller in a 3.3 V or 5 V PCI slot, as shown below. Press down gently, but firmly, to make sure that the card is properly seated in the slot. The bottom edge of the controller card must be flush with the slot. Then attach the MegaRAID controller to the computer chassis with the bracket screw.

Bracket Screw

32-Bit Slots (3.3 V)

64-Bit Slots (5 V)

Each connected SCSI device on a channel must have a unique Target ID (TID), ranging from 0 to 15 for 16-bit devices. The MegaRAID SCSI 320-2 Controller is automatically assigned TID 7, which has the highest priority.

Check all SCSI devices to make sure that no two devices on the same channel are set to the same TID. Change the TIDs as needed. See the SCSI device documentation if you are not sure how to do this.

The MegaRAID SCSI 320-2 Hardware Guide shows examples of how to assign SCSI IDs to various combinations of devices.

Step 8: Set SCSI Termination

The SCSI bus, which consists of connected SCSI cables and SCSI devices, is an electrical transmission line that must be terminated properly to minimize signal reflections and prevent data loss. Disk enclosures normally handle termination for the SCSI devices in the enclosure. Refer to your enclosure documentation for more information.

SCSI termination must be set at each end of each SCSI bus (channel), as shown below. In this example, only internal SCSI devices are connected to one channel of the MegaRAID controller. The MegaRAID controller automatically terminates its end of the SCSI bus if only internal devices or only external devices are connected to that channel. It automatically disables termination if both internal and external devices are connected to that channel, because the MegaRAID controller is then in the “middle” of the bus.

SCSI

Terminator

Termination on Controller

SCSI Devices

Enabled

(Termination Disabled on Both)

For a disk array, set SCSI bus termination so that removing or adding a SCSI device does not disturb termination. To do this, connect the MegaRAID SCSI 320-2 Controller to one end of the SCSI cable and connect a SCSI terminator module at the other end of the cable. Attach SCSI devices to the connectors between the two ends, and disable termination on them.

The following example shows an external drive enclosure with seven SCSI drives. Termination is enabled at the end of the cable nearest the “last” SCSI drive, which is assigned SCSI ID6 (TID 6).

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