Error and Notification Messages
www.3ware.com
231
0019 Drive removed
This message is posted whenever a drive is removed from the controller while
the controller is powered on.
If you use 3DM2 to ‘Remove’ a drive from a redundant unit, you can then
replace that drive and start a rebuild without needing to backup your data.
If the drive is not part of a redundant unit, then before removing it, you will
need to backup your data.
For information on rebuilding degraded units, see “To verify a unit through
3BM” on page 154.
001A Drive inserted
This message is posted whenever a drive is connected to the controller while
the controller is powered on.
001E Unit inoperable
Drive removal caused a unit to become inoperable. This message is sent after
offline unit timer expires (20 seconds); if the unit becomes operational before
the timer expires (20 seconds) there will be no message since there were no
IO errors.
001F Unit Operational
Drive 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 sent only
after the offline timer expires (20 seconds).
0021 Downgrade UDMA mode
The 3ware RAID controller communicates to the ATA disk drives through the
Ultra DMA (UDMA) protocol. This protocol ensures data integrity across the
ATA cable by appending a Cyclical Redundancy Check (CRC) for all ATA
data that is transferred. If the data becomes corrupted between the drive and
the 3ware RAID controller (e.g., an intermittent cable connection) the 3ware
RAID controller detects this as a UDMA CRC or cable error. The 3ware
RAID controller then retries the failed command three times at the current
UDMA transfer rate. If the error persists, it lowers the UDMA transfer rate
(e.g., from UDMA 100 to UDMA 66) and retries another three times. This
message is sent to you when the 3ware RAID controller lowers the UDMA
transfer rate.
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).
