Installing drives, Figure 7-3, Figure 7-4 – Dell PowerVault 775N (Rackmount NAS Appliance) User Manual
Page 66: Figure 7-5, Scsi interface cables, Scsi configuration information, External scsi tape drive, Scsi id numbers, Device termination
Installing Drives
Dell™ PowerVault™ 775N Systems Installation and Troubleshooting Guide
SCSI Configuration Information
Activating the Integrated RAID Controller
Replacing a RAID Controller Card
Installing the SCSI Cable Strain-Relief Bracket
Installing a SCSI Backplane Daughter Card
Your system contains up to five 1-inch SCSI hard drives. A CD drive and a diskette drive are mounted together on a tray that
slides in the front panel and SCSI backplane board. This design allows the diskette and CD drives to be serviced without
removing the cover or connecting and disconnecting cables. This section contains instructions for replacing these devices.
SCSI Interface Cables
SCSI interface connectors are keyed for correct insertion. Keying ensures that the pin-1 wire in the cable connects to pin 1 in
the connectors on both ends. When you disconnect an interface cable, take care to grasp the cable connector, rather than the
cable itself, to avoid stress on the cable.
SCSI Configuration Information
Although SCSI devices are installed in essentially the same way as other devices, their configuration requirements are
different. To configure an external SCSI device, follow the guidelines in the following subsections.
SCSI ID Numbers
Each device attached to a SCSI host adapter must have a unique SCSI ID number from 0 to 15.
A SCSI tape drive is configured by default as SCSI ID 6.
NOTE:
There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the
cable in order by ID number.
Device Termination
SCSI logic requires that termination be enabled for the two devices at opposite ends of the SCSI chain and disabled for all
devices in between. For internal SCSI devices, termination is configured automatically. For external SCSI devices, you should
disable termination on all devices and use terminated cables. See the documentation provided with any optional SCSI device
you purchase for information on disabling termination.
External SCSI Tape Drive