OWC MERCURY ELITE PRO DUAL MINI
SYSTEM SETUP
8
2.3.2 RAID Modes
Span Mode:
The drives show up as one large single volume. The total size will depend on the
drives installed; you can use drives of different capacities. A span is an array (not RAID)
in which the data is written sequentially across the drives. This combines the capaci-
ties of the drives, but it does not provide any performance or redundancy benefits.
RAID 0 “Drive Striping” Mode:
The drives show up as one large single volume with a size equal to the combined
capacities of both drives. RAID 0 is used when speed is the primary objective, but it
does not have any redundancy for protection. Data is alternated very quickly across
both drives to gain speed by distributing the workload. This allows for the fastest data
transfer rates, but if one drive fails, the whole array can become corrupted and data
will be lost. Always maintain a backup of your data!
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.
2.4 DRIVE FAILURE
In the event that one of the drives fails, the corresponding drive LED will turn solid red.
If the Mercury Elite Pro Dual mini 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.
If the drive was part of a RAID 1 array, then it can be replaced. In the meantime, the data
will remain accessible through the other drive in the RAID 1 array. If the Mercury Elite
Pro Dual mini was purchased with drives already installed and it is still under warranty,
see Section 3.4 for information on how to contact OWC technical support. If the unit is
outside its warranty or was purchased without drives, follow the instructions in Section
2.2 to access and replace the failed drive. After the failed drive is replaced, the RAID 1
array will be rebuilt automatically. This process may take several hours to a day, based on
the capacity of the drives. NOTE: The failed drive must be replaced with a drive that is
identical in model and capacity.
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