Adaptec 412R User Guide - Page 101

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. Figure 6-2 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). Disk Channel SCSI ID DISK CHANNEL ERR 1:00 TskStat: 21 Error Code Figure 6-2 Disk Channel Error Example Table 6-3 Disk Channel Error Codes Error Code 04 05 20 21 22 23 24 30 31 32 40 Description Data overrun or underrun occurred while getting sense data. Request for sense data failed. Selection time-out occurred (displayed as Sel Timeout). Controller detected an unrecoverable protocol error on the part of the target. Unexpected bus-free condition occurred (displayed as Unex Bsfree). Parity error on data was received from a target displayed as Parity Err). Data overrun or underrun has been detected (displayed as Data OvUnRn). Target reported busy status (displayed as Device Busy). Target reported queue full status (displayed as Queue Full). Target has been reserved by another initiator. Controller aborted an I/O request to this target because it timed out (displayed as I/O Timeout). 6-17