Chapter 11. Troubleshooting
232 3ware Serial ATA RAID Controller User Guide
024h Sbuf memory test failed
The 3ware RAID controller, as part of its data integrity features, performs
diagnostics on its internal RAM devices. Once a day, a non-destructive test is
performed on the cache memory. Failure of the test indicates a failure of a
hardware component on the 3ware RAID controller. This AEN is sent to
notify the user of the problem. If the controller is still under warranty, contact
3ware Technical Support for a replacement controller.
025h Cache flush failed; some data lost
To improve performance, this 3ware RAID controller features caching layer
firmware. For write commands this means that it acknowledges it has
completed a write operation before the data is committed to disk. If the 3ware
RAID controller can not commit the data to the media after it has
acknowledged to the host, this AEN is posted to the user.
Typically, the LOST CACHED WRITE notification would be an indication of
a catastrophic failure of the drives in the array, such as loss of power to
multiple drives in an array.
026h Drive ECC error reported
This AEN may be sent when a drive returns the ECC error response to an
3ware RAID controller command. The AEN may or may not be associated
with a host command. Internal operations such as Background Media Scan
post this AEN whenever drive ECC errors are detected.
Drive ECC errors are an indication of a problem with grown defects on a
particular drive. For redundant arrays, this typically means that dynamic
sector repair would be invoked (see AEN 023h). For non-redundant arrays
(JBOD, RAID 0 and degraded arrays), drive ECC errors result in the 3ware
RAID controller returning failed status to the associated host command.
027h DCB checksum error detected
The 3ware RAID controller stores certain configuration parameters on a
reserved area of each disk drive called the Drive Configuration Block (DCB).
As part of power-on initialization, the 3ware RAID controller performs a
checksum of the DCB area to ensure consistency. If an error occurs, please
contact 3ware technical support. The drive’s DCB has been corrupted.
028h DCB version unsupported
During the evolution of the 3ware product line, the format of the DCB has
been changed to accommodate new features. The DCB format expected by
the 3ware RAID controller and the DCB that is written on the drive must be
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