IBM T400F manual Fixing Fibre Channel Errors, Starting Problem Determination

Fixing Fibre Channel Errors

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 77.

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 page 6). 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 (see “Fibre Channel Attachment” on page 6).

4.Ensure that the Fibre Channel cables are installed correctly. Refer to the appropriate steps in Chapter 3, “Installing the Tape Drive” on page 13.

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 80

v“Fixing a Consistent Error in a Point-to-Point Topology” on page 80

v“Fixing Intermittent Fibre Channel Errors” on page 81

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 “Setting the Arbitrated Loop Physical Address (Fibre Channel Drive Only)” on page 19). 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 9 on page 36).

vIf the test fails, replace the tape drive.

vIf 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 9 on page 36).

vIf the test fails, replace the fiber cable.

vIf 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.

Chapter 6. Resolving Problems 79