Drive Failure; Replacing Drives - OWC MERCURY ELITE PRO DUAL Assembly Manual & User Manual

Span Mode:
Both drives show up as a single large disk, but one which functions differently than RAID 0. The total size
will depend on the drives installed; unlike RAID 0 or RAID 1 you can use drives of different capacities. A
Span is an array (but not a RAID) in which the data is written sequentially across the drives. When one drive
becomes full, subsequent data is written to the second drive. This combines the capacities of the drives,
but it does not provide any performance or data redundancy benefits.
Independent Drive Mode
Each drive will appear individually without being combined. If you are using drives of differing capacity and
model, or if you are using only one drive, this is the mode to use.

2.4 Drive Failure

If one of the drives fails, the corresponding drive LED will turn solid red. If the Mercury Elite Pro Dual was configured
as a RAID 0 or Span, the data on the array is lost and the disk is no longer usable. In a span, only the data stored
on the failed drive is lost, although data recovery software will be required to retrieve the data from the other drive.
If the drives were configured independently, then the data on the drive that did not fail will remain intact.

2.4.1 Replacing Drives

If the Mercury Elite Pro Dual is set up as a RAID 1, a drive that has failed can be replaced. The data will remain
accessible via the functioning drive until the array is rebuilt with a new drive. If the enclosure was purchased
with drives and it is still under warranty, contact OWC technical support for assistance (see Section 3.5). If
the unit is outside its warranty or was purchased without drives, follow the assembly instructions in Section
2.2 to access and replace the failed drive.
If the Drive 1 LED is solid red, the failed drive is the one connected to the data and power cable labeled as
Port 1 on the printed circuit board (Section 2.2 Step 4). If the Drive 2 LED is solid red, the failed drive is the
one connected to the data and power cable labeled Port 2.
Note
Once the drive has been replaced, if the Mercury Elite Pro Dual is configured as a RAID 1, the array will
automatically begin to rebuild when the enclosure is powered on. This process may take several hours to
more than a day, based on the capacity of the drives. During the rebuild process, the LED for both drives will
blink green. The Rebuild LED will blink orange.
If possible, leave the Mercury Elite Pro Dual powered on during the entire rebuild process; if power is
interrupted (or the computer sleeps), the unit will continue rebuilding automatically when power is restored.
Once the rebuild process is complete, the rebuild LED will turn off and the LED for the rebuilt drive will
resume normal activity. See Section 1.6 for more information on the behavior of the LEDs.
Note
OWC MERCURY ELITE PRO DUAL
A failed drive must be replaced with an identical drive (model, capacity, firmware).
The Mercury Elite Pro Dual needs an active data signal to remain powered on. If it is disconnected
from the computer, or if the computer goes to sleep or turns off, the device will power off.
To minimize the total rebuild time, it is recommended to keep the device connected to the
computer (with the computer powered on), and disable any hard drive sleep settings on the
computer for the duration of the rebuild process.
9
DEVICE SETUP