IBM System Storage DS3500 Introduction And Implementation Manual page 440

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Figure 14-120 Run Controller Diagnostics
2. The Run Diagnostics window shown in Figure 14-121 on page 417 will open. In this
window you choose the tests that you want to run on the selected controller. Select the
check boxes for the diagnostic tests to be run. There are two tests applicable to the
DS3500:
– Read test: this test initiates a read command as it would be sent over an I/O data path.
The read test compares data with a known, specific data pattern, and the test checks
for data integrity and redundancy errors. If the read command is unsuccessful or the
data compared is not correct, the test considers that the controller is in error. The test
fails the controller.
– Write test: this test initiates a write command as it would be sent over an I/O data path
to the diagnostics region on a specified drive. This diagnostics region is then read and
compared to a specific data pattern. If the write fails or the data compared is not
correct, the test fails the controller and places the controller offline.
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IBM System Storage DS3500: Introduction and Implementation Guide
Note: The data loopback test only runs on controllers that have Fibre Channel
connections between the controller and the drives. The DS3500 has SAS
connections between the controller and the drives, therefore this test does not apply
to the DS3500 and this option is not enabled.
Draft Document for Review March 28, 2011 12:24 pm