external 6091-8200/9300 DLT (Digital Linear Tape)

	FECO:	TP # 8
	MODIFICATION No:	N/A
	PRODUCT:	DLT TAPE DRIVES
	SUB-ASSEMBLY	N/A
	CLASS OF CHANGE:	INFORMATIONAL
	REASON FOR CHANGE:	TO RELEASE DETAILS OF DLT DRIVES NCR 6091 (External) Quantum DLT2000xt Series (Internal)

1.1     The external 6091-8200/9300 DLT (Digital Linear Tape) is a high performance, high capacity, streaming
          cartridge tape designed for use on mid-range and high-end computers. Running in compression mode and
          using a 2:1 data compression ratio, the DLT drive features a formatted capacity of 40 GB and a
         sustained data transfer rate of 3.0MB per second. The DLT is a 5 1/4 inch form factor, 1/2 inch drive. The
         design includes a dual-channel read/write head, high efficiency data compression, and a tape mark
         directory to maximise data access time.

          Used for unattended backups of archiving, the DLT subsystem allows you to back up data at a higher
          capacity and at a higher speed. The DLT drive, when operating in a non-compressed mode, has a
          maximum transfer rate of 1.5MB per second. When operating in compressed mode, the maximum transfer
          rate is 3.0MB per second write, and 3.5MB per second read.

          The DLT drive accepts the new comptape iv cartridge. When this cartridge is used, you can store up to
          20GB or 40GB with compression mode. The exact amount of data stored in the compression mode
          depends on the data type.

1.2     the internal DLT2000xt is similar to the external version detailed above; but has a capacity of 15MB or
          30MB with compression mode, with a compac tapeiii cartridge; and a maximum sustained data transfer
          rate of 2.5MB per second.

           Each system comes with the DLT in an external chassis, rubber feet and a power cable. A relevant SCSI
           cable is also needed. If no other items are to be connected externally then a terminator will be needed.
           If the DLT is not the last device on the SCSI bus you will need two SCSI cables. If you are stacking one
          subsystem on another, you will need a stacking kit for each subsystem except the first one. A maximum
          of four 6091 DLT subsystems can be stacked (this would require 3 stacking kits) if you are stacking more
          than two 6091 DLT subsystems you will need a stability kit.

           On a system with no other SCSI devices the first DLT 6091 must have the four rubber feet installed
           on the bottom of the first unit unless a stacking kit is also being installed. Because the 6091 is an
           external device it will have its own SCSI differential controller and the address of the DLT will be id3.
           This is the factory default. A second DLT will have an id of 4.

To change the SCSI address the rear panel will have to be removed. The following two figures show how
this is achieved.

The DLT's must be set to hardware compression because at present the command "hwdcset" does not
work on DLT's. You will not get the throughput unless compression is set.

            This is an internal DLT that uses 2 bays on the s40 the SCSI id is 5 while on the 4300 a SCSI id of 3
            is to be used. Using data compression the DLT2000xt drive features formatted capacity of 30 GB and a
            sustained data transfer rate of 2.5 MB/s.

The DLT2000xt includes flash eeprom technology that allows easy on-site installation microcode
updates from tape.

1)connect on end of the SCSI cable to the left most SCSI connector on the DLT200xt rear panel.

3)connect the other end of the SCSI cable to the SCSI connector on the system or for a daisy chain
configuration to another SCSI device.

4)if this is the last device terminator must be plugged into right hand SCSI socket.

2 diagrams of DLT200xt deck left and right side and picture of pins on SCSI id connector.

A jumper must always be installed on the remote id present position for the host to recognize any id
selection on this connector. Must always be present.

            Must always have parity check enabled so move jumper so it only fits one pin. The 4300 will always
            have the first internal DLT set to id 3 whereas the s40 will always be set to id %. Also set term
            power/enable active termination both connectors enabled.

Density selection is only available when you use compac tapeiii cartridges. When you use a compac
tape iiixt the tape automatically selects the 15GB format.

            Using the compac tapeiii the density defualts to 10.0 GB native mode. The only selection is for this
            cartridge is 2.6, 6.0 and 10.0 compression of or 20.GB compression on. Using the compac tapeiii the
            user can select density by using any of the following operations:

1. On all read operations and all write append operations, the recorded density is th the density to be
used.

The density select button. Using the densityselect button always overrides a host selection.

A programmable host selection via your operating system (the density override is off, indicating
automatic or host selection.)

Native default destiny 10.00 GB for the compac tapeiii and 15GB from the compac tapeiii (assuming the
density select button or the host selection was not used).

1. Load tape in the drive. The yellow tape in use light blinks while the tape loads and calibrates.

            4. You can use the drive's control panel at various times, not just after loading a tape. Density
            selection is inactive until the write from bot command is issued. The controller remeMBers the density
            selection state until you do one of the following:

If you have loaded a compac tapeiii tape with a prerecorded 2.6GB density and you use the density
select button to select 10.0GB density, the following should happen:

The 2.6 light remains lit - density has not changed yet and the steady light indicates recorded tape
density.

            If the density select button is not used then the light show the actual density when the tape is reading
            and writing. The lights are on steady and the density override is off. The density select button is used
            and if the actual tape density button is the same as the density who selected then for example
            is the tape density is 10GB and selected density is 10GB then the indicator next to 10.00 lights.

            If the density select button is used and if the actual tape density differs from the density selected
            then the actual density light is on steady. The light with the selected density blinks and the density
            override light is steady.

4. Observe the indicators on the dcl200xt front panel. Ensure the indicator sequence of events in the
same as in the table below. Events on the right and left sides happen at the same time.

1.the lights on the front panel turn on sequentially from top to bottom. All lights stay on for a few
seconds.

2.all lights on the left front panel turn on at the same time for about three seconds and then turn off.

3.the green operate handle, the orange write protect and the yellow use cleaning tape lights turn off.
The yellow tape in use light blinks while the tape drive initialises.

4.after initialisation, if no cartridge is loaded, the yellow tape in use lights off, the green operate handle
light turns on, the handle unlatches and the beeper sounds.

            Post completes in about 15 seconds and the drive responds normally to all commands. However it might
            take longer for the media to become ready. After bus reset, the tape drive responds within a bus
            selection time-out period.

If all the left had lights on the dlf200xt front panel blink only then the post test has failed.