OWC MerCury raCk PrO IntrOduCtIOn
3. The OWC Mercury Rack Pro is now set to the new mode. If the Rack Pro has just been
set to “Clear RAID” mode, you can now repeat steps 1 and 2 to apply a RAID setting. If
the Rack Pro has just been set to a RAID mode, it is now ready to be formatted. Instruc-
tions for formatting can be found at: h t t p:// www.macsales.com/format
1.7.2 RAID Modes
IMPORTANT NOTE: Drives of identical size and model are required for all RAID types
other than Clear/JBOD (Independent Drive) mode and Combine/
JBOD (SPAN) mode.
Clear/JBOD (Independent Drive) Mode
Switch setting: DOWN-DOWN-DOWN
Each drive will appear as a single volume. If you intend to use hard drives of differing ca-
pacity and model, this is the mode to use. To swap or replace drives, unmount all drives
and power the OWC Mercury Rack Pro off.
Combine/JBOD (SPAN) Mode
Switch setting: UP-DOWN-UP
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. JBOD (SPAN) is an array (not RAID) in
which the data is written sequentially across the drives. This combines the capacities of
the drives, but it does not provide any performance or redundancy benefits.
RAID 0 “Drive Striping” Mode
Switch setting: UP-UP-UP
The drives show up as one large single volume with a size equal to the combined ca-
pacities of all the drives used in the array. 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 two or more drives to gain speed by distributing the workload. This allows
for the fastest data transfer rates, since data is written without pausing to check parity
information, but if one drive fails, the whole array can become corrupted and data will
be lost. Always maintain a backup of your data!
Storage Capacity
Data Safety
Performance
Storage Capacity
Data Safety
Performance
4
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