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Fixing Fibre Channel Errors
Starting Problem Determination
Before starting the problem determination, perform the following steps:
1. Determine the type of Fibre Channel topology that you are using (see
“Supported Topologies” on page 4).
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 (see “Fibre
Channel Attachment” on page 3).
4. If you are connected to a Fibre Channel Storage Area Network (SAN) by using
a SAN Data Gateway, use the IBM Storage Area Network Gateway Module
Setup, Operator, and Service Guide to determine whether the problem is
occurring between the drive and the SAN Data Gateway. If you are using a
SCSI drive and are having SCSI problems, see “Fixing SCSI Bus Errors” on
page 65.
5. Ensure that the Fibre Channel cables are installed correctly. Refer to the
appropriate steps in “Chapter 3. Installing the Tape Drive” on page 9.
6. 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 68
v “Fixing Intermittent Fibre Channel Errors” on page 68
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 (see “Step 6. Set the
Arbitrated Loop Physical Address (Fibre Channel Drive Only)” on page 15). 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 Table 7 on page 29).
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 Table 7 on page 29).
v If the test fails, replace the fiber cable.
v If the test is successful, go to step 6.
6. Check the Fibre Channel cable connection at the server.
7. Using a device driver utility such as ntutil or tapeutil, verify that the drive is
properly configured and available at the server.
8. If the problem persists, the fault may be with the server’s hardware or software.
Refer to your server’s service manual.
9. When the problem is corrected (or determined to be a server problem), restore
all of the fiber cables to their correct position.
Chapter 6. Resolving Problems 67
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