Performing Diagnostics
Running Loopback and Read/Write Buffer Diagnostic Tests
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Running the Loopback Test
The loopback test is external to the adapter. If the adapter port is in loop mode, you can run the loopback test with a loopback connector. If the adapter port is in
The test evaluates the ports (transmit and receive transceivers) on the adapter. More specifically, the loopback test transmits and receives (loopback) the specified data, performs a frame cyclic redundancy check (CRC), and looks for disparity and length errors.
To run a loopback test:
1.Prepare for the test (see “Preparing for Diagnostic Testing” on page
2.Set the diagnostic test parameters (see “Setting the Diagnostic Test Parameters” in the help system).
3.Run the diagnostic test (see “Running Diagnostic Tests” in the help system).
4.View the diagnostic test results (see “Viewing the Diagnostic Test Results” in the help system).
5.Prepare for normal adapter operations (see “Preparing for Normal Adapter Operations” on page
NOTE:
The loopback test must be run with the loopback connector (unless the operating system uses one of the driver versions listed in the Table
The loopback test is disabled if you are using inbox drivers with SLES 10.0.
Running the Read/Write Buffer Test
The read/write buffer test sends specified data through the SCSI Write Buffer command to a target device (disk or tape). It then reads the data back through the SCSI Read Buffer command and compares the data for errors. The test also compares the link status of the device before and after the read/write buffer test. If errors occur, the test indicates a broken or unreliable link between the adapter port and the device.
NOTE:
Link status is disabled if you are using inbox drivers with SLES 10.0.
