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Troubleshooting
Disk Channel Errors
Disk channel errors are similar to disk-detected errors, except they
are detected by the controller, instead of the disk drive. Some disk
channel errors are displayed as text strings, others are displayed as
hexadecimal values.
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
describing the affected disk array (if any).
Figure 6-2 Disk Channel Error Example
Table 6-3 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).
23
Parity error on data was received from a target displayed
as Parity Err).
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.
40
Controller aborted an I/O request to this target because it
timed out (displayed as I/O Timeout).
DISK CHANNEL ERR
Disk Channel
SCSI ID
Error Code
1:00
TskStat:
21
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