Quick Hardware Setup Guide
Step 6: Connect SCSI Devices to MegaRAID Controller
External
Density
SCSI
Connectors
J4 J5
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Internal
SCSI Connectors
J2
J3
Channel 0 | Channel 1 |
J10
DIMM Socket
J16
Connect SCSI devices to the internal
Disable SCSI termination on all devices that are not connected at the end of the SCSI bus. Use only
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
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
Step 5: Install MegaRAID SCSI 320-2 Controller
Install the MegaRAID SCSI
Bracket Screw
Each connected SCSI device on a channel must have a unique Target ID (TID), ranging from 0 to 15 for
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
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
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).