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How RAID 10 works
RAID 10, also written RAID 1+0, combines RAID 1 mirroring and RAID 0 striping. In the conventional layout, drives are grouped into mirrored pairs; data is then striped across those pairs. Each pair holds duplicate copies of its portion of the data, while striping distributes work across pairs. Oracle describes software RAID 1+0 as combining RAID-0 and RAID-1 for performance and data redundancy in its Oracle Linux software RAID reference.
RAID 10 is not RAID 0+1
The nesting order matters. RAID 10 stripes across mirrored pairs. RAID 0+1 mirrors striped sets. Oracle’s older Linux reference explains that after a disk failure, a RAID 0+1 mirror can become unusable until its failed set is replaced and repopulated; RAID 10 instead loses a member of one mirror pair and can continue using that pair’s remaining copy. These are stable layout distinctions, but operational steps should come from the documentation for the platform in use.
Drive count depends on the implementation
Four drives is the conventional minimum for a nested RAID 1+0 array. Oracle Linux 8’s LVM instructions specify at least four devices for RAID 10. Linux MD offers configurable RAID 10 layouts, including options for replica count and near, far, or offset arrangements, so do not assume every software implementation follows the same four-drive mirrored-pair rules. Check the supported layout and requirements for the system you plan to configure.
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- Note:The eSATA port on this product does not support the use of a computer’s SATA-to-eSATA adapter. Hot-swapping is not supported. The computer’s eSATA port must support RAID functionality to properly access multiple drive bays via the eSATA port; otherwise, only one drive bay can be accessed.
- 【Reliable External Storage System for Individuals】The 3.5 hard drive enclosure supports 2.5/3.5 inches HDD and SSD , max capacity up to 80TB( 20TB for each hard drive), it's a ideal external hard drive enclosure for personal or enterprise using.Save space on your desktop or laptop.
- 【No heat,】The 4 bay hard drive reader built in Aluminum-Alloy materials and 2 inch Fans.Maximize the security of your data.NOTE：Fan noise is around 40-50 decibels, not recommended if you are very sensitive to noise.
- 【8 Raid Modes】This external hdd raid enclosure supports RAID 0/1/3/5/10, CLONE, LARGE, NORMAL.NOTE:When replacing RAID, you need to go back to NORMAL and set the desired RAID mode.Designing RAID may result in data loss.MAC OS no Raid software. Raid Mode Switching Method Disconnect the power, use a screwdriver, toggle the paddle to the corresponding mode, press and hold the reset button, turn on the power, hold reset for ten seconds, the raid mode will be successfully switched.
- 【Up to 5Gbps】This raid enclosure equips with JMS567+JMB393 chip and USB 3.0, eSATA output interface.
How much capacity RAID 10 provides
With conventional two-way mirroring, roughly half the members’ raw capacity is available for data before formatting and metadata. For example, four equal 4 TB drives provide about 8 TB before those deductions. That figure follows from the layout arithmetic; it is not a vendor benchmark. Unequal drive sizes and implementation details can reduce usable space further.
This is RAID 10’s central capacity tradeoff. RAID 5 uses distributed parity rather than a complete duplicate on every mirror member, so it can provide more usable space from the same number of drives; parity calculations and writes affect performance. The right comparison depends on the workload and platform, not capacity alone.
Rank #2
- High Speed Data Transmission: The D2-320 hard drive enclosure (a DAS, NOT a NAS) adopts USB 3.2 Gen2 protocol for high-speed data transmission up to 10Gbps. With 2 hard drives in RAID 0, the read/write speed can reach up to 521MB/s (SATA III HDD 8TB x 2). With 2 SSD's in RAID 0, the read speed can reach 1075MB/s (SATA III 1TB SSD x 2)
- Multiple RAID Configurations: The D2-320 is a hardware RAID enclosure and it supports RAID 0, RAID 1, JBOD and SINGLE which can better satisfy various demands of users. In RAID 1, data will be in a mirror backup. When there is a damaged hard drive, you can directly replace the hard drive, and the data will be recovered automatically. This provides an absolute security for the data
- Super-Large Storage Capacity: The D2-320 USB storage enclosure can support up to two 3.5" and 2.5" SATA HDD, as well as 2.5" SATA SSD, with a maximum capacity of 22TB per drive, providing users with up to 44TB (22TB x 2) of storage space
- Intelligent Temperature Control: The D2-320 HDD enclosure has an intelligent temperature-controlled and low-noise fan that automatically adjusts its speed based on the temperature of the hard disk. This feature ensures that the hard disk operates at its best temperature and provides better heat dissipation
- Tool-Free Hard Drive Installation: The D2-320 external hard drive enclosure features a tool-free hard drive tray design that allows for easy installation and removal of hard drives without the need for any tools. Furthermore, the D2-320 incorporates a brand new Push-lock unique design from TerraMaster, which automatically locks the hard drive tray when you insert the hard drive, preventing the hard drive from falling out or disconnecting
What performance to expect
RAID 10 can distribute work across striped pairs, and a mirror can offer alternate read sources. Those design features can help parallel I/O, but there is no universal speed multiplier. Writes must keep mirrored copies consistent, and real results depend on the workload, drives, controller or software implementation, queueing, and whether the array is healthy or degraded.
Consider the workload, not just the RAID label
- Sequential transfers: Striping can distribute work across drives, but the result depends on the devices and how the controller or software handles the transfer.
- Random I/O: Parallel access and alternate read sources may help, but the benefit depends on request patterns and queueing.
- Read-heavy work: Multiple copies can offer read-source flexibility; the implementation determines whether and how it uses that flexibility.
- Write-heavy work: Each write must be reflected in mirror copies. Do not assume writes double in speed or scale linearly with drive count.
- Latency: Throughput alone does not establish response time. Measure with the actual application and configuration.
For a server, workstation, or NAS, evaluate the storage on the intended hardware and software with the real workload. A RAID level by itself cannot predict a reliable performance figure.
Rank #3
- 【Reliable External Storage System for Individuals and business】The 3.5 hard drive enclosure supports 2.5/3.5 inches HDD and SSD, max capacity up to 20TB for each hard drive, it's a ideal external hard drive enclosure for personal or enterprise using.Save space on your desktop or laptop.
- 【4 Raid Modes】!!!NOTE:Press and hold the "Reset" button for 5 seconds after reset the RAID array!!!This raid enclosure supports 4 RAID Modes(RAID 0, RAID 1, Normal, JBOD).Designing RAID may result in data loss.MAC OS no Raid software.
- 【No heat】The 2 bay hard drive reader built in Aluminum-Alloy materials and 2 inch Fan.Maximize the security of your data.NOTE：Fan noise is around 40-50 decibels, not recommended if you are very sensitive to noise.
- 【Up to 5Gbps】This dual bay raid enclosure equips with JMS561 chip and USB 3.0 output interface.
- 【Wide Compatibility, Plug and Play】Equipped with USB A/C 3.0 Cable.Compatible with Windows 7 and above, Mac 9.1 and above, Linux.Plug and play, no fuss, no muss.
How many drive failures can RAID 10 survive?
There is no single failure count that applies to every RAID 10 layout. In the conventional mirrored-pair arrangement, one drive can fail in a pair while its partner retains that pair’s data. The array may also survive failures in other pairs. If both members of any one pair fail before recovery, that pair has lost its data and the array may fail. The Linux MD manual explicitly makes RAID 10 fault tolerance dependent on configuration.
What happens after a drive fails
- Identify the failed member and check the array’s health with the supported tools for your platform.
- Follow the platform or vendor’s procedure to install a compatible replacement.
- Allow the mirror to be restored, then verify that the array reports healthy status.
Exact commands and replacement steps differ between hardware RAID, Linux MD, and other implementations. Consult the relevant platform guide rather than applying a procedure from a different system. Linux’s mdadm manual documents management of Linux MD arrays. During a degraded period, the array has less redundancy, and performance may be affected.
Rank #4
- !!!NOTE:When the 8-bay enclosure being used, there is at least one hard drive must be inserted into HDD1-HDD4, same goes for HDD5-HDD8, 2 HDDs is a minimun quantity to be inserted.Please read the instructions carefully before trying!!!Be sure to save a good backup of your data before setting up RAID, which will format your hard drive after setting up RAID!!!!!!
- NOTE: When using this product, please first confirm that the hard drive loaded into this product is normal, otherwise it will lead to not out of the drive, such as loading more than one hard drive, it will only show one, can not confirm which one is bad, please load a hard drive, power on, out of the drive a, confirm that it is normal, turn off, and then load the second, in the power on, out of the drive two, to confirm that it is normal, and so on, one by one to load, until you find the The problematic hard drive. For example, if there is a problem with one of the 8 hard drives, only one drive will come out.
- 【Reliable External Storage System for Individuals】The 3.5 hard drive enclosure supports 2.5/3.5inches HDD and SSD , max capacity up to 160TB( 20TB for each hard drive), Not compatible with WD 20TB hard drives, but supports Seagate 20TB hard drives.it's a ideal external hard drive enclosure for personal or enterprise using.Save space on your desktop or laptop.
- 【8 Raid Modes】This external raid enclosure supports CLONE, LARGE/ LARGE*2, NORMAL, RAID0*2, RAID5*2, RAID50, RAID00. NOTE:When replacing RAID, you need to go back to NORMAL/PM10 and set the desired RAID mode.Designing RAID may result in data loss. !!!Raid Mode Switching Method!!! Disconnect the power, use a screwdriver, toggle the paddle to the corresponding mode, press and hold the reset button, turn on the power, hold reset for ten seconds, the raid mode will be successfully switched.
- 【No heat】The 8 bay hard drive reader built in Aluminum-Alloy materials and two 2.9 inch Fans.Maximize the security of your data. NOTE：Fan noise is around 40-50 decibels, not recommended if you are very sensitive to noise.
RAID is not a backup
RAID can keep storage available through some drive failures; it does not provide an independent historical copy. It cannot by itself recover data lost to accidental deletion, corruption, theft, or site loss. Maintain a separate backup appropriate to the data and recovery needs.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When RAID 10 makes sense
RAID 10 is a candidate when performance and protection from certain drive failures matter more than usable capacity. HPE describes RAID 1+0 as useful where high performance and data protection outweigh capacity efficiency in its ProLiant RAID 1 and RAID 1+0 guide. That is vendor guidance, not proof that RAID 10 is optimal for every database or server.
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Best Value
- [Flexible RAID Mode Management]: This 3.5-inch RAID HDD enclosure supports eight configuration modes, namely 0, 1, 3, 5, 10, JBOD, CLONE, and CLEAR. It enables dual data backup, enhances data security, and caters to the individualized needs of diverse users. Note: It is advisable to back up your data before mode switching. If you have any inquiries, please do not hesitate to contact us
- [Supports 22TB Single Disk]: The 5-bay HDD enclosure accommodates 3.5-inch SATA disks, and the maximum storage capacity amounts to 110TB. It can effortlessly fulfill the storage requirements of large-scale engineering projects, high-resolution video footages, and other large-capacity data, eliminating concerns about capacity shortages
- [5Gbps Data Transfer]: The USB 3.0 interface of the external hard drive bay is compatible with SATA 6 Gbps, and the transfer speed reaches up to 235MB/s, facilitating effortless backup and transfer of files and videos, enabling centralized management and enhancing work efficiency
- [Effective Heat-dissipation]The 3.5-inch aluminum HDD case is outfitted with an 80mm silent cooling fan. Front and rear vents are designed, and the airflow effectively dissipates heat, ensuring the stable and efficient operation of the equipment over an extended period
- [Safety Protection]: The RAID enclosure features a bracket-free design for quick disassembly and assembly and possesses an independent safety locking mechanism to effectively prevent the unexpected removal or loss of the hard disk and guarantee the security of data
Before choosing, compare the options against the needs of your own deployment:
- Usable capacity: How much space remains from the planned drive count and sizes?
- Workload behavior: Does the actual read, write, throughput, and latency profile suit the layout?
- Failure combinations: Which specific member failures can the layout tolerate?
- Recovery behavior: How are replacement and rebuild handled, and what happens while the array is degraded?
- Platform support and cost: Does the controller or software support the chosen layout, and does the full drive configuration fit the budget?
RAID 10 compared with RAID 5 and RAID 6
These layouts make different tradeoffs. RAID 10 uses mirror copies and striping; RAID 5 distributes parity and generally spends less capacity on redundancy than full mirroring. The supplied platform documentation does not establish a universal performance or rebuild ranking for RAID 10, RAID 5, and RAID 6, so compare the supported implementations and test the workload that matters.
| Layout | Capacity tradeoff | Performance and writes | Failure and recovery considerations |
|---|---|---|---|
| RAID 10 (conventional two-way mirrors) | About half of raw member capacity is usable before formatting and metadata. | Striping can distribute I/O; writes must maintain mirrored copies. No universal speed multiplier is established. | Tolerance depends on failure placement: multiple members may fail if each affected pair retains a copy; losing both members of one pair can defeat the array. |
| RAID 5 | Distributed parity consumes less space than full mirroring, according to Oracle’s software RAID reference. | Oracle notes parity calculation and writes affect performance; workload-specific figures are not established here. | Consult the specific platform documentation for its failure tolerance and recovery behavior. |
| RAID 6 | Not stated in the cited documentation. | Not stated in the cited documentation. | Not stated in the cited documentation. |
Hardware RAID and software RAID are distinct implementation paths. Red Hat’s RHEL 10 storage documentation covers storage management and mdraid, with mdadm identified as the Linux MD management utility. Confirm support for the specific operating system, controller, enclosure, and RAID layout before configuring or buying drives.
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