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Chapter 5 Managing Storage
Creating Volumes
Volume Types
The features of each volume type are explained below.
Notes:
• To create a RAID volume, use RAID Builder instead of the Disk Management option in Windows Storage Server.
• When volumes are deleted or formatted, or the RAID mode is changed, all data stored on the volumes is erased.
Before executing these operations, back up any important data.
• In this manual, “recover means reverting the TeraStation (including the data) to its former state prior to the drive
failure. It doesn’t refer to reading data from a failed hard drive.
• RAID resynchronization will run automatically after a volume is created. File transfers will be slower while it is
running, which will take about 5 hours per terabyte.
• After a volume is created, unused extra space can’t be added to the volume.
• Some space on each drive is not accessible because it is used by the system. The amount used on each drive is
below.
Drive 1: 50 MB
Drive 2: 50 MB
Drive 3 to 6: 100 GB + 150 MB
RAID 5 Volumes
*
The unallocated areas of three or more hard drives are used as a single volume. The usable space is equal to the sum
of the capacity of the drives minus the capacity of one drive.
If one drive in a RAID 5 volume fails, data on the volume can be recovered after the failed drive is replaced. However,
if two or more drives fail, all data is lost.
*Available for 6-drive and 4-drive models.
Mirrored Volumes (RAID 1)
The unallocated areas of two drives are combined into a single volume. The usable space is equal to the capacity of
a single drive.
Because the same data is written to both drives simultaneously, if one drive fails, data can be recovered from the
other drive. If both drives in the RAID volume fail, data cannot be recovered.
Striped Volumes (RAID 0)
The unallocated areas of two or more drives are combined into a single volume. The usable space is equal to the
sum of the capacity of the drives.
Data cannot be recovered if even a single drive fails.
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