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Setting the Loop ID to Provide Status About the Loop
If Feature Switch 3 on the Ultrium 2 Tape Drive is set to OFF (see 1 in Figure 6),
the LID/status connector 2 has the following definition:
v Pins 1, 2, 3, 4, 7, and 8 are inputs and are used to set the LID.
v Pins 5 and 6 are used as outputs:
– Pin 5 has three states: off (ground), on (3.3 V), and alternating (between off
and on). Pin 5 will be off if the drive does not detect light on the Fibre
Channel connector, if (while communicating as an L_port) the drive does not
complete the Loop Initialization Protocol (LIP), or if (while communicating as
an N_port) the drive does not complete logging in to the host or switch. Pin 5
will be on if the drive detects light, successfully completes the LIP process, or
logs in to another port. After the drive has completed the LIP process, the pin
will be alternating when the drive is receiving SCSI commands, and the pin
will be on when the drive is not receiving SCSI commands.
– Pin 6 indicates that the drive detects light. If pin 6 is on but pin 5 is off, this
could indicate communication problems across the fiber cable.
– If the drive is installed in an enclosure, pins 5 and 6 may be used to support
external indicators, such as light-emitting diodes (LEDs), on the enclosure.
Note: If indicators are used on an enclosure, the drive does not report error
codes 8 and F (Fibre Channel problems) to the single-character
display. Instead, pins 5 and 6 signal to the indicators that there is a
problem.
v Pin 9 is ground.
To set the AL_PA:
__ 1. Determine an unused AL_PA for the drive and refer to Table 5 on page 21 for
its corresponding LID.
__ 2. Locate the LID/status connector on the drive (see 2 in Figure 6).
__ 3. Place jumpers on pins 1, 2, 3, 4, 7, and 8 as shown in Table 5 on page 21.
By using hard addressing, you can specify one of 62 valid AL_PAs for the
drive. If you place jumpers on the four top and bottom pins on the right (a
total of eight pins), the drive gets the AL_PA from a field in its vital product
data (VPD). (A tape library can set the AL_PA in the VPD through the LDI
interface.) If you do not place jumpers on any pins, the drive uses soft
addressing to determine the AL_PA.
Figure 6. Setting the Loop ID and the AL_PA. The feature switches are located on the bottom
of the drive.
20 IBM TotalStorage LTO Ultrium 2 Tape Drive