3Ware 9550SXU-16ML User Guide - Page 231
h Upgrade UDMA mode, 023h Sector repair completed, 024h Sbuf memory test failed
UPC - 693494971606
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AEN Messages Possible causes of UDMA CRC errors are bad interface cables or cable routing problems through electrically noisy environments (e.g., cables are too close to the power supply). 022h Upgrade UDMA mode During 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. 023h Sector repair completed The 3ware RAID controller supports a feature called dynamic sector repair to allow the unit to recover from certain drive errors that would normally result in a degraded array situation. For redundant arrays such as RAID 1, 10, 50, and 5, the 3ware RAID controller essentially has two copies of the users data available. If a read command to a sector on a disk drive results in an error, it reverts to the redundant copy in order to satisfy the host's request. At this point, the 3ware RAID controller has a good copy of the requested data in its cache memory. It will then use this data to force the failing drive to reallocate the bad sector, which essentially repairs the sector. When a sector repair occurs, the user is notified by this AEN. The fact that a sector repair AEN has been sent to the user is an indication of the presence of grown defects on a particular drive. While typical modern disk drives are designed to allow several hundred grown defects, special attention should be paid to any drive in an array that begins to indicate sector repair messages. This may be an indication of a drive that is beginning to fail. The user may wish to replace the drive, especially if the number of sector repair errors exceeds 3 per month. 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. www.3ware.com 221