Chapter 12. Troubleshooting236 3ware Serial ATA RAID Controller User Guide• A RAID 10 unit with both drives missing from one of the RAID 1subunits.• A RAID 6 unit with three or more drives missing.Note: The controller only generates this message if the unit is missing drivesfor more than 20 seconds. This allows a hot-swap of a drive to be completedwithout generating this error.ActionThe unit is no longer available for use. Return all missing drives to the unit. Ifthe drives are physically present, check all data and power connections.CAUTION: Do not delete the inoperable unit and recreate it as this willoverwrite the data and make data recovery very difficult.You may wish to contact technical support at http://www.3ware.com/support.See Also“About Inoperable Units” on page 138.001F Unit OperationalEvent TypeInformationCauseDrive insertion caused a unit that was inoperable to become operational again.Any data that was on that unit will still be there. This message is only sent ifthe unit was inoperable for more than 20 seconds. That means that if the hot-swap of a drive occurred within 20 seconds, messages are not generated.ActionNone Required. The unit is available for use.0021 Downgrade UDMA modeEvent TypeWarningCauseThe 3ware RAID controller has downgraded the UDMA transfer rate betweenthe controller and the ATA disk drives. This message only applies to parallelATA and certain legacy serial ATA drives.
