User manual QUANTUM DAT 160 03-2007

[. . . ] User's Guide User's Guide User's Guide User's Guide User's Guide User's Guide DAT 160 DAT 160 81-81794-01 A01 Quantum DAT 160 User's Guide, P/N 81-81794-01 A01, March 2007. Making copies or adaptations without prior written authorization of Quantum Corporation is prohibited by law and constitutes a punishable violation of the law. This document was created by Hewlett-Packard Company ("HP") for Quantum. Neither HP nor Quantum make any warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. [. . . ] To change the SCSI ID after installation, power down both the computer and the tape drive, change the drive's SCSI ID, power up the tape drive, and then power up the computer. Connecting the SCSI Cable 3 A wide VHD-to-HD SCSI cable and LVD terminator are provided to connect your Quantum DAT 160 tape drive to a VHD SCSI port on an LVD SCSI bus. If your server has an HD SCSI port, you must either purchase and install a VHD-to-HD adapter or use an HD-to-HD cable Quantum DAT 160 User's Guide 29 Chapter 3 Installing External Tape Drives Connecting the SCSI Tape Drive instead of the supplied cable. Refer to our web site for recommended products: www. quantum. com/support. Caution: To avoid damaging the computer or tape drive, ensure that both are powered off while you attach the SCSI cable. 1 Make sure you are connecting to a recommended SCSI bus type. For optimum performance, we recommend that your Quantum DAT 160 drive is installed on a dedicated SCSI bus. 2 Perform a normal system shutdown and turn off the server and any connected peripherals. 3 Attach the VHD connection on the SCSI cable to the server's external SCSI connector and secure it by tightening the screws. Figure 18 Connecting the SCSI Cable LVD SCSI terminator 4 Attach the HD connection on the SCSI cable to one of the SCSI connectors on the rear panel of the tape drive and secure it by tightening the screws. 5 Connect the LVD terminator to the drive's other SCSI connector and tighten the screws to secure it. Quantum DAT 160 User's Guide 30 Chapter 3 Installing External Tape Drives Checking SCSI Termination Why Does the Tape Drive Need a Terminator? 3 Terminators are essential, as they provide the correct voltages on the SCSI bus and prevent unwanted signal reflections from interfering with data transfers. The rule is: There must be termination at both physical ends of the bus and only at the ends. Normally the HBA forms one end of the SCSI bus and provides termination. You, therefore, need to ensure that the other end of the bus is terminated. If the tape drive is at the end of the SCSI bus, the terminator must be attached to the tape drive. If you want to attach additional devices to the SCSI bus after the tape drive, you will need to remove the SCSI terminator and attach the next device to this SCSI connector. Make sure that you attach the terminator to the last device in the chain. Always use an LVD terminator (supplied with the tape drive) or a multimode terminator. See Checking SCSI Termination for more information about SCSI cables and termination. Checking SCSI Termination If the external tape drive is the last or only device in the SCSI chain, install a terminating plug on the unused SCSI connector on the drive's back panel. This terminator typically is a small, rectangular plastic block that is marked SCSI Terminator. Figure 19 shows two examples of using SCSI termination. Quantum DAT 160 User's Guide 31 Chapter 3 Installing External Tape Drives Connect the Power Cable Figure 19 Two SCSI Termination Examples for the External Tape Drives External SCSI device SCSI Terminators External Tape Drive External Tape Drive External SCSI device SCSI Controller (termination disabled) SCSI Controller (termination enabled) Example 1: SCSI termination in a system that has only external SCSI devices. Internal SCSI device (termination enabled) Example 2: SCSI termination in a system that has both internal and external SCSI devices. Connect the Power Cable An external Quantum DAT 160 drive will operate using any voltage in the range 100­240 volts (0. 7 A, 50-60 Hz). To connect your drive to the power supply, proceed as follows: 1 Make sure that the drive is switched OFF (O side down). 2 Plug the power cable securely into the socket on the rear panel of the drive. 3 Plug the other end of the power cable into the power outlet. Quantum DAT 160 User's Guide 32 Chapter 3 Installing External Tape Drives Completing Your Installation Figure 20 Connecting the Power Cable Power Cable Completing Your Installation To complete and test your external tape drive installation: 1 Reconnect the power cord to the computer's power connector. 2 Use the On/Off Switch on the back of the external tape drive to turn on the drive (see figure 20). [. . . ] · Interrupt devices, such as keyboards and mice, typically send brief but important input information to the system. · Isochronous devices, such as web cameras, typically require timely transmission of data, such as a video stream. · Bulk transfer, such as printers and CD-ROM, must receive or transmit 100% accurate data. But how fast or often the data is transmitted is not as important as the accuracy of the data. [. . . ]