OWC MERCURY ELITE PRO DUAL
SYSTEM SETUP
8
RAID 1 “Drive Mirroring” Mode:
The drives show up as one volume with a size equal to the capacity of one of the two
drives used in the array. RAID 1 copies (or “mirrors”) a set of data from the first drive
to the second drive. This is useful when reliability and redundancy are more important
than capacity. When one drive fails, it can be replaced and the data will be rebuilt
automatically. RAID 1 is NOT RECOMMENDED in the Mercury Elite Pro Dual due to the
lack of any indication of a drive failure.
2TB MODE:
When switch #1 is in the OFF position, the total capacity of the drives is limited to a
maximum of 2.2TB for compatiblity with older operating systems. If setting switch #1
to ON does not initially allow volume sizes to exceed 2.2TB, do the following: keeping
switch #1 in the ON position, change to a different RAID level, then turn on the unit.
Format the new RAID volume, then shut off the unit, change to the desired RAID level,
and turn on the unit.
2.4 DRIVE FAILURE
In the event that one of the drives fails, if the Mercury Elite Pro Dual was configured as a RAID
0 or span, the data on the array is lost and the volume cannot be used. In a span, only the
data stored on the failed drive is lost, although data recovery software will be required to
recover the data from the other drive in the span.
2.4.1 Drive Replacement
If the drive was part of a RAID 1, it can be replaced and the array will be rebuilt. In the
meantime, the data will remain accessible through the other drive in the RAID 1. If the
Mercury Elite Pro Dual was purchased with drives already installed and it is still under
warranty, see Section 3.5 for information on how to contact OWC technical support to
arrange for replacement.
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. Identifying which of
the two drives has failed may not be simple due to the fact that the Mercury Elite Pro
Dual does not track the health of the drives. This is why RAID 1 is not recommended
in this enclosure. Each drive can be individually removed and tested inside a computer
or another drive enclosure to determine the failed drive, which can then be replaced.
2.4.2 Rebuilding a RAID 1
After the failed drive is replaced, if the Mercury Elite Pro Dual is configured as a RAID 1,
the array will automatically begin the rebuild process when it is turned on. This process
may take from several hours up to more than a day, based on the capacity of the drives. It
is recommended to leave the Mercury Elite Pro Dual turned on during the entire rebuild
process, but if power is interrupted, the unit will continue rebuilding automatically when
power is restored. This device has no way of indicating when a rebuild is taking
place or when the rebuild is done.
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