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TR-004 User Guide
4. RAID Configuration
This section provides information on configuring the RAID settings on the external RAID enclosure.
Important
The following situations will interrupt the USB connection to the RAID enclosure, causing
data being written to the drives to be lost.
• Creating or deleting a RAID group while another RAID group or disk is in use
• RAID group failure (excluding degraded mode), or adding or removing a RAID group
while another RAID group is in use
• Inserting or removing a drive when the RAID enclosure is in Individual mode
• Pressing and holding the Set button for three or more seconds, until the RAID
enclosure beeps
Supported RAID Types
The external RAID enclosure supports several RAID types.
Important
• When disks with different capacities are combined in one RAID group, all disks
function according to the capacity of the smallest disk. For example, if a RAID group
contains five 2 TB disks and one 1 TB disk, the total capacity will be 6 TB.
• When different types of disk (HDD, SSD) are combined in one RAID group, the RAID
group functions according to the speed of the slowest disk.
• QNAP recommends creating separate RAID groups for each capacity and type of disk.
Note
The RAID enclosure does not support capacity expansion or RAID-level migration.
RAID Type
Number of Disks
Description
JBOD (Just a Bunch of
Disks)
2 or more
• JBOD combines disks together in a linear
fashion. The system writes data to a disk until it is
full, and then writes to the next disk.
• JBOD allows all of the disks capacity to be used,
but does not provide any disk failure protection or
performance benefits.
• Unless you have a specific reason to use JBOD,
use RAID 0 instead.
RAID Configuration 21