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Activity LED
The Activity LED glows to indicate the unit has power and blinks to indicate
activity. It does not show RAID status.
Mode Switch
The Mode switch has four settings, described in detail below:
Jbod
This setting creates a non-RAID array called LARGE.
Number of drives: 2
Unit capacity: 100% of all drives together regardless of differences in size
Fault tolerance: cannot withstand the loss of any drives without losing data.
However, some data may be recovered as long as the top drive carrying the
file system data (boot record, directory, etc.) remain online. LARGE mode is
neither a RAID nor is it a JBOD. It works by declaring the sum of all available
space of the member drives as a single unit, without striping the data. After
the first member is filled, new data is stored on the second.
RAID 1
This setting creates a Mirror Set.
Number of drives: 2
Unit capacity: size of the smallest member.
Fault tolerance: RAID 1 can withstand the loss of one drive without losing
data.
RAID 1 works by duplicating the exact same data on both drives.
RAID 0
This setting creates a Stripe Set.
Number of drives: 2
Unit capacity: size of the smallest member times two.
Fault tolerance: none - if either member is lost all data is lost.
RAID 0 “stripes” the file system across the array by placing “chunks” of data
sequentially between drives in a specific order.
Nor
This setting allows the drives to act independently of each other (“JBOD
mode”).
Number of drives: 1 or 2.
Unit capacity: N/A (100% of each individual drive)
Fault tolerance: none
JBOD mode offers both connected units to the host adapter, no RAID is
defined at all.
NOTE:
JBOD mode with two drives requires a SATA controller featuring Port
Multiplier support.