Dell DCL and 3 Podręcznik Użytkownika Pobierz pdf (Strona 143)

PERC 3/QC Hardware Installation 141

Figure 10-3. Example of Termination

For a disk array, set SCSI bus termination so that removing or adding a

SCSI device does not disturb termination. An easy way to do this is to

connect the PERC 3/QC card to one end of the SCSI cable and to connect

an external terminator module at the other end of the cable. The

connectors between the two ends can connect SCSI devices. Disable

termination on the SCSI devices. See the manual for each SCSI device to

disable termination.

SCSI Termination

The SCSI bus is an electrical transmission line and it must be terminated

properly to minimize reflections and losses. You complete the SCSI bus by

setting termination at both ends.

You can let PERC 3/QC automatically provide SCSI termination at one end

of the SCSI bus. You can terminate the other end of the SCSI bus by

attaching an external SCSI terminator module to the end of the cable or by

attaching a SCSI device that internally terminates the SCSI bus at the end

of the SCSI channel.

Selecting a Terminator

Use standard external SCSI terminators on a SCSI channel operating at 10

MB/s or higher synchronous data transfer.

Termination on Controller

Enabled

SCSI Devices

(Termination Disabled on Both)

SCSI

Terminator

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 253 254

Brak uwag

Dell DCL and 3 Podręcznik Użytkownika Strona 143