Chapter 12. Troubleshooting232 3ware Serial ATA RAID Controller User Guide0022 Upgrade UDMA modeDuring the self-test, if a drive is found to not be in the optimal UDMA mode,the controller will upgrade its UDMA mode to be optimal.0023 Sector repair completedThe 3ware RAID controller supports a feature called dynamic sector repair toallow the unit to recover from certain drive errors that would normally resultin a degraded unit situation. For redundant units such as RAID 1, 10, 50, and5, the 3ware RAID controller essentially has two copies of your dataavailable. If a read command to a sector on a disk drive results in an error, itreverts to the redundant copy in order to satisfy the host’s request. At thispoint, the 3ware RAID controller has a good copy of the requested data in itscache memory. It will then use this data to force the failing drive to reallocatethe bad sector, which essentially repairs the sector. When a sector repairoccurs, you are notified by this message.The fact that a sector repair message has been sent to you is an indication ofthe presence of grown defects on a particular drive. While typical modern diskdrives are designed to allow several hundred grown defects, special attentionshould be paid to any drive in a unit that begins to indicate sector repairmessages. This may be an indication of a drive that is beginning to fail. Youmay wish to replace the drive, especially if the number of sector repair errorsexceeds 3 per month.0024 Sbuf memory test failedThe 3ware RAID controller, as part of its data integrity features, performsdiagnostics on its internal RAM devices. Once a day, a non-destructive test isperformed on the cache memory. Failure of the test indicates a failure of ahardware component on the 3ware RAID controller. This message is sent tonotify you of the problem. If the controller is still under warranty, contact3ware Technical Support for a replacement controller.0025 Cache flush failed; some data lostTo improve performance, the 3ware RAID controller features caching layerfirmware. For write commands this means that it acknowledges it hascompleted a write operation before the data is committed to disk. If the 3wareRAID controller can not commit the data to the media after it hasacknowledged to the host, this message is posted.Typically, the Cache Flush Failed notification would be an indication of acatastrophic failure of the drives in the unit, such as loss of power to multipledrives in a unit.To troubleshoot the reasons for the failure, collect the logs for your systemand contact 3ware technical support at http://www.3ware.com/support/
