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Accounting systems often opt for RAID 1 as they deal with critical data and require high reliability. RAID 1 is used for mission-critical storage that requires a minimal risk of data loss. Requires powering down your computer to replace failed drive.More expensive (needs twice as many drivers).Uses only half of the storage capacity.Provides redundancy and fault tolerance.On the other hand, the write performance remains the same as with one disk and is equal to the slowest disk in the configuration. Apart from reliability, mirroring enhances read performance as a request can be handled by any of the drives in the array. In such a setup, the array volume is as big as the smallest disk and operates as long as one drive is operational. It eliminates the possibility of data loss and downtime by replacing a failed drive with its replica. Unlike with RAID 0, where the focus is solely on speed and performance, the primary goal of RAID 1 is to provide redundancy. This is why such a configuration is also called mirroring. The most common use of RAID 1 is setting up a mirrored pair consisting of two disks in which the contents of the first disk is mirrored in the second. RAID 1 is an array consisting of at least two disks where the same data is stored on each to ensure redundancy. You can set up disk striping on your system along with another RAID array that ensures data protection and redundancy. On the other hand, such a configuration does not necessarily have to be unreliable. If you want to utilize your drives to the fullest and don't mind losing data, opt for RAID 0. RAID 0 is used when performance is a priority and reliability is not. Doesn't provide fault tolerance or redundancy.Cost-efficient and straightforward to implement.This is why it should only be used for non-critical storage, such as temporary files backed up somewhere else. Hence, problems on any of the disks in the array can result in complete data loss. Still, it does not include any redundancy, fault tolerance, or party in its composition. RAID 0 is the most affordable type of redundant disk configuration and is relatively easy to set up. Additionally, developers can implement multiple controllers (or even one per disk) to improve performance. This means that an array composed of two disks, where one is 320 GB, and the other is 120 GB, actually has the capacity of 2 x 120 GB (or 240 GB in total).Ĭertain implementations allow you to utilize the remaining 200 GB for different use. It is important to note that if an array consists of disks of different sizes, each will be limited to the smallest disk size in the setup. Therefore, RAID 0 is generally implemented to improve speed and efficiency. Configuring the striped disks as a single partition increases performance since multiple disks do reading and writing operations simultaneously. This process is called disk striping and involves splitting data into blocks and writing it simultaneously/sequentially on multiple disks. The disks are merged into a single large volume where data is stored evenly across the number of disks in the array. RAID 0, also known as a striped set or a striped volume, requires a minimum of two disks. The following list explains the standard RAID levels (0, 1, 2, 3, 4, 5, 6) and popular non-standard and hybrid options (RAID 10).
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Therefore you can choose between hardware RAID, software RAID, and firmware RAID.
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RAID levels are grouped into the following categories:Īdditionally, you can choose how to implement RAID on your system.
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Raid 2: Bit-Level Striping with Dedicated Hamming-Code Parity.