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Chapter 4: Troubleshooting
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Disk channel errors
Disk channel errors are similar to disk-detected errors, except they are detected
by the controller, instead of the drive. Some disk channel errors are displayed
as text strings, others are displayed as hexadecimal values.
The following illustration shows a disk channel error displaying the
hexadecimal codes. Most disk channel errors are informational because the
controller issues retries to correct any problem. Errors that cannot be corrected
with retries will result in another critical event.
Disk channel error codes
Error code Description
04 Data overrun or underrun occurred while getting sense
data.
05 Request for sense data failed.
20 Selection time-out occurred (displayed as Sel Timeout).
21 Controller detected an unrecoverable protocol error on
the part of the target.
22 Unexpected bus-free condition occurred (displayed as
Unex Bsfree).
24 Data overrun or underrun has been detected (displayed
as Data OvUnRn).
30 Target reported busy status (displayed as Device Busy).
31 Target reported queue full status (displayed as Queue
Full).
32 Target has been reserved by another initiator.