Contents
What is RAID 01 (RAID 0+1)? Easy-to-understand explanation of the basic concepts of data protection and acceleration
Introduction
RAID (Redundant Array of Independent Disks) is a data storage technology that combines multiple hard drives to improve reliability, performance, and capacity. One popular RAID configuration is RAID 01, also known as RAID 0+1. This article aims to provide an easy-to-understand explanation of RAID 01 and its basic concepts of data protection and acceleration.
What is RAID 01?
RAID 01 is a combination of two RAID configurations, RAID 0 and RAID 1. In RAID 0, data is striped across multiple drives, which increases performance by allowing for parallel reading and writing of data. However, RAID 0 alone does not provide any data redundancy or protection against disk failures.
To address this limitation, RAID 1 is introduced. RAID 1 mirrors the data by creating an exact copy on a separate set of drives. This ensures data redundancy and provides protection against disk failures. However, RAID 1 does not provide the same level of performance improvement as RAID 0.
RAID 01 combines the best of both worlds by first striping the data across multiple drives (RAID 0) and then mirroring the striped set (RAID 1). This configuration offers both improved performance and data redundancy.
How does RAID 01 work?
In RAID 01, the data is divided into blocks and written across multiple drives in a striped manner. For example, if we have four drives, the first block of data is written to the first drive, the second block to the second drive, and so on. This striping process allows for parallel data access and accelerates read and write operations.
Next, the striped set is mirrored. Mirroring involves creating an exact copy of the striped set on another set of drives. If we had four drives in the striped set, we would need an additional four drives for the mirror set. This redundancy ensures that even if one drive fails, the data can still be accessed from the mirror set.
In RAID 01, the failure of a single drive in either the striped set or the mirror set does not result in data loss. The system can continue to operate using the remaining drives. However, if multiple drives in the same set fail, data loss can occur.
In conclusion
RAID 01 is a RAID configuration that combines RAID 0 for performance and RAID 1 for data redundancy. It offers improved read and write speeds, high data availability, and protection against disk failures. It is commonly used in scenarios where both performance and data protection are crucial, such as in database servers, file servers, and high-demand applications.
Understanding RAID 01 and its basic concepts of data protection and acceleration is important for IT professionals and individuals seeking to optimize the storage and reliability of their data.
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