The table below lists the topologies in which the Ultrium 3 and Ultrium 4 tape
drives can operate, the Fibre Channel server connections that are available, and the
port (NL, N, FL, or F) through which communication must occur.
Table D-16. Choosing the port for your topology and Fibre Channel connection
Type of Topology
Type of Fibre Channel Connection to Server
Direct Connection (Private) Switched Fabric (Public)
Fibre Channel-Arbitrated
Loop(can be Two-Node
Arbitrated Loop or
Two-Node Switched Fabric
Loop; is limited to two
nodes)
L_Port FL_Port
Point-to-Point(two nodes) N_Port F_Port
Starting Problem Determination
Before starting the problem determination, perform the following steps:
1. Determine the type of Fibre Channel topology that you are using. Ensure that
the drive and the port to which it is attached are configured in compatible
topologies.
2. Using this guide or the service guides of associated switch, hub, or fiber
products, try to determine where the problem exists (whether in the drive,
cable, or the device to which the drive and cable attach).
3. Ensure that the configuration and software levels are supported. To determine
the latest supported attachments or to get a comprehensive list of compatible
software, visit http://www.ibm.com/storage/lto.
4. Ensure that the Fibre Channel cables are installed correctly.
5. Go to one of the following procedures:
v “Fixing a Consistent Error with a Single Drive on a Fibre Channel Loop”
v “Fixing a Consistent Error with Multiple Drives on a Fibre Channel Loop” on
page D-56
v “Fixing a Consistent Error in a Point-to-Point Topology” on page D-56
v “Fixing Intermittent Fibre Channel Errors” on page D-57
Fixing a Consistent Error with a Single Drive on a Fibre
Channel Loop
1. Ensure that the tape drive is powered ON.
2. Verify that the tape drive's serial number is the same as the drive serial number
that the server program is using.
3. Ensure that the drive's Fibre Channel AL_PA is set correctly, that it is on the
loop, and that it is not being used by another device. The tape drive must be
able to detect light and communicate with the server.
4. Run the Fibre Channel wrap test at the drive's Fibre Channel connector (see
Function Code 6 in “Function Code 6: Run Host Interface Wrap Test” on page
D-32).
v If the test fails, replace the tape drive.
v If the test is successful, go to step 5..
5. Run the Fibre Channel wrap test at the end of the fiber cable (see Function
Code 6 in “Function Code 6: Run Host Interface Wrap Test” on page D-32).
Appendix D. Using Ultrium Drives D-55
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