Drive ECC errors are an indication of grown defects on a particular drive. For redundant units, this typically means that dynamic sector repair has been invoked (see message
0023 Sector repair completed). For non-redundant units (Single Disk, RAID 0 and degraded units), which do not have another copy of the data, drive ECC errors result in the 3ware RAID controller returning failed status to the associated host command.
Schedule periodic verifications of all units so that drive ECC errors can be found and corrected. If the unit is non-redundant a unit file system check is recommended.
For Mac OS X, you can use the First Aid tab in the Disk Utility—select the disk on the left and then click Verify Disk. If verification encounters problems, you can then use the Repair Disk option on the same screen.
