LSI Series 518 6.2.10Step 10: Set Target IDs

Use this procedure to connect SCSI devices:

1.Disable termination on any SCSI device that does not sit at the end of the SCSI bus.

2.Conﬁgure all SCSI devices to supply TermPWR.

3.Set proper target IDs (TIDs) for each SCSI device.

4.Distribute SCSI devices evenly across the SCSI channels for optimum performance.

5.Do not exceed the maximum cable length for the number and type of SCSI devices you are using. (See Table 1.1 for details.)

6.Try to connect all non-disk SCSI devices to a SCSI channel that has no SCSI disk drives connected to it.

6.2.9.1Cable Suggestions

System throughput problems can occur if SCSI cable use is not maximized. Here are some cabling guidelines:

•Use the shortest SCSI cables.

•LVD mode cable lengths should be no more than 25 meters with two devices and no more than 12 meters with eight devices.

•Use active termination.

•Avoid clustering the stubs.

•Cable stub length should be no more than 0.1 meter (4 inches).

•Route SCSI cables carefully.

•Use high-impedance cables.

•Do not mix cable types (choose ﬂat cable for inside the enclosure, and round shielded cables for outside the enclosure.)

•Ribbon cables have fairly good cross-talk rejection characteristics.

6.2.10Step 10: Set Target IDs

Set target identiﬁers (TIDs) on the SCSI devices. Each device in a speciﬁc SCSI channel must have a unique TID in that channel. Non-disk devices (CD-ROM or tapes) should have unique SCSI IDs regardless of the channel where they are connected. See the documentation for each SCSI device to set the TIDs. The MegaRAID SCSI 320-2 controller

6-18	Hardware Installation