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
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.
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