3Ware 7000-2 User Guide - Page 184

3ware Escalade ATA RAID Controller User Guide 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. AEN 024h AEN_SBUF_FAIL The ATA RAID controller, as part of its data integrity features, performs diagnostics on its internal RAM devices. Once a day, a nondestructive test is performed on the cache memory. Failure of the test indicates a failure of a hardware component on the ATA RAID controller. This AEN is sent to notify the user of the problem. AEN 025h AEN_LOST_CACHED_WRITE To improve performance, this ATA 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 ATA 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. AEN 026h AEN_DRIVE_ECC_ERROR This AEN may be sent when a drive returns the ECC error response to a ATA 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 nonredundant arrays (JBOD, RAID 0 and degraded arrays), drive ECC 184 www.3ware.com