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What is RAID 10?

What is RAID 10?

A  RAID (Redundant Array of Independent Disks) basically refers to when two different storage media combine to form one large drive. The specific function is determined by the respective RAID levels which can be combined as in the case with RAID 10 (1+0). Its key advantages are enhanced reliability and increased performance of the hard disks used. RAID 10, is also known as RAID 1+0 or mirrored striped RAID and is a combination of two RAID levels: RAID 1 (mirroring) and RAID 0 (striping). 

  • Mirroring (RAID 1): The data is duplicated on multiple drives to create an exact copy. For example, if you have four drives in a RAID 10 configuration, you divide them into two pairs. Each pair contains the same data, ensuring redundancy. 
  • Striping (RAID 0): The mirrored pairs are then striped together to create a single logical volume. Data is split into blocks and distributed across the mirrored sets. This striping allows for improved read and write performance since multiple drives can simultaneously access different parts of the data. 

RAID 10 is a technology for ensuring more efficient website data security. It provides both data redundancy and improved performance by striping data across multiple mirrored sets of drives. 

How RAID 10 works

Yes, you have successfully created your blog or website, and so the  next thing to do, is to ensure that your data is secure and  in the case of any mishaps, retrievable. Data is completely safeguarded as the mirrored duplicate remains accessible in the event of a disabled or unavailable originating drive. Due to its full data duplication, RAID 1 necessitates twice the storage capacity of the original data.

While RAID 0 does not offer any data protection, its primary purpose is to enhance drive access performance. This is achieved by distributing the data across multiple drives, allowing multiple read/write heads to access or write data portions simultaneously, thereby increasing overall processing speed.

RAID 10, on the other hand, combines data redundancy and improved performance. It serves as an excellent choice for I/O-intensive applications such as email, web servers, databases, and operations requiring high disk performance. Moreover, it is well-suited for organizations that demand minimal downtime.

The exceptional performance and the ability to accelerate both write and read operations make RAID 10 particularly suitable for frequently used, mission-critical database servers. However, the minimum requirement of four disks makes RAID 10 a relatively expensive option for smaller computing environments. The 100% storage capacity overhead may be excessive for small businesses and consumer usage.

In a RAID 10 configuration, all data is always duplicated within the hard disk assembly. For every gigabyte of user data, an additional gigabyte is allocated for mirroring purposes. Typically, a set of four hard disks is chosen, with each pair combining into a RAID 1 system, which is then combined into a single RAID 0 system.

One of the notable advantages of RAID 10 is its system output rate. By striping the data, individual sub-blocks are available in parallel. When an application accesses the system, it can simultaneously read from multiple disks, receiving multiple data segments from a single strip. In comparison to a single hard disk lacking this option, RAID 10 optimizes read speed consistently.

How RAID 10 differs from other forms of RAID

RAID 10, also referred to as RAID 1+0, distinguishes itself among various RAID configurations due to its unique nested structure. By combining two RAID levels, RAID 10 enhances overall performance. Similar nested RAID levels include 01/0+1, 03/0+3, 50/5+0, 60/6+0, and 100/10+0.

While RAID 1+0 shares similarities with RAID 0+1, the order of the numbers signifies a distinctive layering arrangement. RAID 1+0 initiates by mirroring two drives and subsequently creating a striped set with this mirrored pair. Conversely, RAID 0+1 generates two stripe sets and then mirrors them. Although both RAID levels employ the same number of drives, they are not interchangeable. 

Key features of RAID 10:

1. Redundancy: RAID 10 provides high data redundancy since each drive has a mirrored copy. If one drive fails, the data can be rebuilt from its mirror without any loss. This redundancy offers increased fault tolerance and helps protect against data loss. 

2. Accelerated Performance: RAID 10 offers enhanced performance due to the striping feature. The data is spread across multiple drives, allowing for parallel read and write operations. This results in faster data access and improved I/O performance, especially for applications with heavy disk usage. The combination of mirroring and striping in RAID 10 allows for both redundancy and high performance, making it ideal for applications that require fast access to data, such as online transaction processing (OLTP) systems or multimedia editing. 

3.Capacity Utilization:

RAID 10 utilizes half of the total drive capacity for mirroring. For example, if you have four drives, only half of the capacity will be usable, as the other half is reserved for mirroring. This means that the usable capacity is equal to the capacity of a single drive in the array. 

 4. Rebuild Time:

In the unfortunate event of a drive failure, RAID 10 offers speedy recovery times. If a drive  fails in a RAID 10 array, the rebuild time is relatively fast since it only involves copying data from the surviving mirror drive. Since the data is mirrored, the rebuilding process involves copying the data from the surviving mirror drive to a replacement drive. This process is considerably faster than the reconstruction required by other RAID configurations, where parity calculations come into play. Such as with other RAID levels like RAID 5 or RAID 6, which require more complex calculations for data recovery. 

With RAID 10, businesses can minimize downtime and maintain productivity even during drive failures, ensuring continuous operations.

5. Flexibility and Scalability:

One of the notable advantages of RAID 10 is its flexibility and scalability. Unlike RAID 5, which requires a minimum of three drives, RAID 10 can be implemented with just four drives, offering greater flexibility for small-scale deployments. Additionally, as businesses grow and require additional storage capacity, RAID 10 allows for straightforward expansion by adding more mirrored pairs of drives. This scalability ensures that businesses can adapt their storage infrastructure to meet evolving data requirements efficiently.


In the ever-evolving digital world, data protection, availability, and performance are critical for businesses to thrive. RAID 10 emerges as a powerful solution, combining the advantages of both mirroring and striping to provide exceptional redundancy and performance. Its ability to withstand drive failures, deliver fast recovery, and cater to diverse business needs make it a standout choice among other RAID versions.

Whether you’re running a database-driven application, managing high-demand servers, or simply safeguarding critical data, RAID 10 ensures the utmost protection and performance. You should invest in web hosting companies such as Cubithost, that uses RAID 10, to prioritize your data security needs.

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