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Chapter 4 Storage Management
RAID Modes
TeraStations support many types of RAID. The type of RAID arrays available for use depends on how many drives are
installed in your TeraStation.
Notes:
If you change the RAID mode, all data on the array is deleted. This is true for every procedure in this chapter.
Always back up any important data before performing actions that affect your RAID array.
Some RAID arrays allow you to change the RAID mode without losing data by adding drives. To change a RAID
mode by adding drives to the existing array, refer to the “Expanding RAID Capacity without Deleting Data” section
below.
Drive capacity is displayed in Settings in actual gigabytes. The Properties window in Windows may show GiB
instead, which will be a smaller number.
If the TeraStation is restarted or shut down while changing the RAID mode, the message that appears on the LCD
panel will change from I46 or I47 to I18.
RAID 5, 6, and 10 are only available for the TeraStation with four or more drives inserted.
RAID 6
RAID 6 arrays are available for TeraStations with four or more drives. RAID 6 combines four or more drives into a
single array. The usable space is equal to the sum of the capacity of all drives minus the capacity of two drives. For
example, if four drives are combined into a RAID 6 array, the usable space is the sum of the capacity of two drives. If
two drives in the array are damaged, you can recover data by replacing them. If three or more drives are damaged,
your data is lost.
RAID 5
RAID 5 arrays are available for TeraStations with three or more drives. RAID 5 combines three or more drives into a
single array. The usable space is equal to the sum of the capacity of the drives minus the capacity of one drive. For
example, if four drives are combined into a RAID 5 array, the usable space is the sum of three drives. If one drive in
the array is damaged, you can recover data by replacing the damaged drive. If two or more drives are damaged at
the same time, your data is lost.
RAID 10
RAID 10 arrays are available for TeraStations with four or more drives. In this mode, mirrored pairs of drives in RAID 1
arrays are combined into a RAID 0 array. The usable space is equal to the capacity of the smallest drive multiplied by
the number of drives divided by two.
RAID 1
Combines two or more drives into a mirrored array. The available space in the array is the capacity of a single drive.
Identical data is written to each drive. If a drive is damaged, data can be recovered by replacing the damaged drive.
As long as one drive in the array remains undamaged, all data in the array can be recovered.
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Chapter 4 Storage Management
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