QTS RAID type comparison

Last modified date: 2024-10-14

Applicable Products

QTS

Details

QTS supports several RAID types. Each type provides a different combination of striping and redundancy.

Important

For best performance and space efficiency, when creating a RAID group, you should use disks of the same brand, same disk type (all HDD, all SSD, or all SAS), and same capacity.
If different types of disks are combined in one RAID group, the RAID group will function according to the speed of the slowest disk.
If disks with different capacities are combined in one RAID group with disk failure tolerance, 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, QTS detects six 1 TB disks.
If you mix disks of different capacities, QNAP recommends the following:
1. Create a separate RAID group for each capacity.
2. Combine the RAID groups using storage pools.
Increasing the number of disks in a RAID group increases the risk of simultaneous disk failure and lengthens rebuild times.
For example, a RAID group with 24 drives is 20 times more likely to fail with RAID 6 than with RAID 60. When creating a storage pool with a large number of disks, you should split the disks into sub-groups using RAID 50 or RAID 60.

RAID Type	Number of Disks	Disk Failure Tolerance	Capacity	Overview
Single	1	0	Capacity of the one disk	Uses a single disk for storage. Provides no disk failure protection or performance benefits. Suitable for single disk configurations that have a data backup plan in place.
JBOD (just a bunch of disks)	2 or more	0	Total combined disk capacity	Combines disks together in a linear fashion. QTS writes data to a disk until it is full before writing to the next disk. Uses the total capacity of all the disks. Not a real RAID type. It provides no disk failure protection or performance benefits. Unless you have a specific reason to use JBOD, you should use RAID 0 instead.
RAID 0	2 to 16	0	Total combined disk capacity	Disks are combined together using striping. RAID 0 offers the fastest read and write speeds, and uses the total capacity of all the disks. Provides no disk failure protection. This RAID type must be paired with a data backup plan. Recommended for high-performance applications such as video editing.
RAID 1	2	1	Half of the total combined disk capacity	An identical copy of data is stored on each disk. Half of the total disk capacity is lost, in return for a high level of data protection. Recommended for NAS devices with two disks.
RAID 5	3 to 16	1	Total combined disk capacity minus 1 disk	Data and parity information are striped across all disks. The capacity of one disk is lost to store parity information. Striping means read speeds are increased with each additional disk in the group. Recommended for a good balance between data protection, capacity, and speed.
RAID 6	4 to 16	2	Total combined disk capacity minus 2 disks	Data and parity information are striped across all disks. The capacity of two disks are lost to store parity information. Recommended for critical data protection, business and general storage use. It provides high disk failure protection and read performance.
RAID 10	4 to 16 (Must be an even number)	1 per pair of disks	Half of the total combined disk capacity	Every two disks are paired using RAID 1 for failure protection. Then all pairs are striped together using RAID 0. Excellent random read and write speeds and high failure protection, but half the total disk capacity is lost. Recommended for applications that require high random access performance and fault tolerance, such as databases.
RAID 50	6 to 30	1 per disk subgroup	Total combined disk capacity minus 1 disk per subgroup	Multiple small RAID 5 groups are striped to form one RAID 50 group. Better failure protection and faster rebuild times than RAID 5. More storage capacity than RAID 10. Better random access performance than RAID 5 if all of the disks are SSDs. Recommended for enterprise backup with ten or more disks.
RAID 60	8 to 30	2 per disk subgroup	Total combined disk capacity minus 2 disks per subgroup	Multiple small RAID 6 groups are striped to form one RAID 60 group. Better failure protection and faster rebuild time than RAID 6. More storage capacity than RAID 10. Better random access performance than RAID 6 if all of the disks are SSDs. Recommended for business storage and online video editing with twelve or more disks.

Resources

QNAP RAID Calculator

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