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Chapter 4 Managing Your Storage
RAID Arrays
TeraStations support many types of RAID. The type of RAID arrays available for use depends on how many drives are
installed in your TeraStation.
installed in your TeraStation.
TeraStation
Default RAID Mode
TS3400D
TS3400R
TS3400R
RAID 5
TS3200D
RAID 1
Notes:
• If you change the RAID mode, all data on the array is deleted. This is true for every procedure in this chapter.
• 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.
• After the RAID mode is changed (except when creating a RAID 0 array or JBOD), the TeraStation performs a RAID
check that will take about 10 hours per TB. File transfers are slower during this period. While the message “RAID
I17 ARRAYx Resyncing” is displayed on the LCD panel, do not turn off the TeraStation. If you do, the RAID check
starts over.
I17 ARRAYx Resyncing” is displayed on the LCD panel, do not turn off the TeraStation. If you do, the RAID check
starts over.
• If the TeraStation is restarted or shut down while changing the RAID mode, the message displayed on the LCD
panel changes from I46 or I47 to I18.
JBOD
This mode uses the hard drives inside the TeraStation as individual drives. The disk space you can use is the total
capacity of all drives in the TeraStation. If any drive is damaged, then the data on that drive is lost.
capacity of all drives in the TeraStation. If any drive is damaged, then the data on that drive is lost.
RAID 0
Combines 2 or more hard drives into a single array. The usable disk space is the total space of all drives used. This simple
RAID mode offers faster performance than RAID modes that include parity. If a single drive in the array fails, then all data
in the array is lost.
RAID mode offers faster performance than RAID modes that include parity. If a single drive in the array fails, then all data
in the array is lost.
RAID 1
Combines 2 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.
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.
RAID 5
*
RAID 5 arrays are available for TeraStations with 3 or more hard drives. RAID 5 combines 3 or more drives into a single
array. The usable space is equal to the sum of the capacity of the hard drives minus the capacity of one drive. For
example, if 4 drives are combined into a RAID 5 array, the usable space is the sum of 3 drives. If one drive in the array is
array. The usable space is equal to the sum of the capacity of the hard drives minus the capacity of one drive. For
example, if 4 drives are combined into a RAID 5 array, the usable space is the sum of 3 drives. If one drive in the array is