Description

This document provides information on Syslog message: (da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error reported on ACX platform.
Medium errors might be reported for the ACX which results in a panic or the ACX to go in debug prompt / boot loop.
As a result, " CAM Status: SCSI Status Error ", " MEDIUM ERROR asc:11,0 ", and " Unrecovered read error " logs are observed after issuing reset from db prompt.

Symptoms

The NAND media check utility checks for bad blocks in the NAND flash memory that is used for the internal boot media in ACX platforms.
The utility can recover the bad blocks using SCSI protocol extension commands provided by the NAND flash controller vendor.
An unrecoverable error during FS check / image installation could resulted in below logs :-

(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 1f 40 35 0 0 80 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retrying Command (per Sense Data)
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 0 0 1f 40 35 0 0 80 0
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): MEDIUM ERROR asc:11,0
(da0:umass-sim0:0:0:0): Unrecovered read error
(da0:umass-sim0:0:0:0): Retries Exhausted
 

Solution

This could be a transient / permanent hardware error .
Perform these steps to determine the cause and resolve the problem (if any):-
  1. Perform a USB recovery if RE goes into panic boot loop / db prompt.
  2. Analyze the boot logs if ACX is going to the debug prompt / boot loop along with the below logs :
(da0:umass-sim0:0:0:0): Retries Exhausted
g_vfs_done():da0s3f[WRITE(offset=770228224, length=16384)]error = 5
panic: initiate_write_inodeblock_ufs1: already started
Dump complete
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
Kindly contact technical support representative if the USB recovery fails and issue persist, RMA may be needed .

Modification History

12/07/2023: Initial Draft