Avago Technologies MegaRAID SCSI 320-1 (520-1 CH) - Manual (Page 2)

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Quick Hardware Setup Guide
The following diagram shows the location of the jumpers and
connectors on the MegaRAID SCSI 320-1 Controller.
Step 4: Install the MegaRAID SCSI 320-1 Controller
Install the MegaRAID SCSI 320-1 Controller in a 3.3 V or 5 V PCI slot,
as shown in the following figure. 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. Attach the MegaRAID
SCSI 320-1 to the computer chassis with the bracket screw.
Caution: If your board has a memory module, never apply
pressure to the module when inserting the adapter.
Step 5: Connect SCSI Devices to MegaRAID Controller
Connect SCSI devices to the internal high-density 68-pin SCSI
connector (J1) and/or the external very high-density 68-pin SCSI
connector (J7). To achieve maximum data throughput, use only
Ultra320 SCSI devices. The MegaRAID SCSI 320-1 Controller
supports up to 15 Ultra320 devices at a maximum SCSI bus cable
length of 12 meters. You can also connect Ultra160 and Ultra2
SCSI devices. The MegaRAID 320 Storage Adapters User’s 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.
Step 6: Set Target IDs for SCSI Devices
Each connected SCSI device must have a unique Target ID (TID),
ranging from 0 to 15 for 16-bit devices. Note that under the DOS
Advanced SCSI Programming Interface, SCSI devices are limited
to SCSI IDs 1–6. The MegaRAID SCSI 320-1 Controller is
automatically assigned TID 7, which has the highest priority. Check
all SCSI devices to make sure that no two devices are set to the
same TID. Change the TIDs as needed. Refer to the SCSI device
documentation if you are not sure how to do this.
Step 7: 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 details.
SCSI termination must be set at each end of the SCSI bus, as
shown in the following figure. In this example, only internal SCSI
devices are connected to the MegaRAID SCSI 320-1. The
MegaRAID SCSI 320-1 automatically terminates its end of the SCSI
bus if only internal devices or only external devices are connected
to the SCSI bus. It automatically disables termination if both internal
and external devices are connected to the bus, because the
MegaRAID SCSI 320-1 is then in the “middle” of the bus.
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 320-1 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 figure
shows an external drive enclosure with seven SCSI drives.
Termination is enabled at the end of the cable closest to the “last”
SCSI drive, which is assigned SCSI ID6.
J9
J2 J3 J4 J5 J6
J7
J1
Optional Backup
Battery Board
Connector
Internal High-Density
68-Pin SCSI Connector
External
Very
High-Density
68-Pin SCSI
Connector
J8
J10
32-Bit Slots
Bracket
(3.3 V)
64-Bit Slots
(5 V)
Screw
Press
Here
Press
Here
Termination on Controller
Enabled
SCSI Devices
(Termination Disabled on Both)
SCSI
Terminator