An introduction to reduntant array of independent disks a system of using multiple hard drives

Raid setup

JBOD architecture utilizes multiple disks, but each disk in the device is addressed separately. Linux kernel 's md and OpenBSD's softraid A more generic logical volume manager provided with most server-class operating systems, e. All disk spindle rotation is synchronized and data is striped such that each sequential bit is on a different drive. What makes you cringe? For example, you can create a software RAID while installing Linux on your computer — the Linux kernel knows about the RAID and will do the work itself without any special hardware necessary. Windows 8 introduced Storage Spaces. The example essays in Kibin's library were written by real students for real classes. Each disk contains a complete copy of the data. But as stated, no one wants to loose their data which is invaluable as compared to the cost spend for implementing RAID. By putting multiple hard drives together, RAID can improve on the work of a single hard drive and, depending on how it is configured, can increase computer speed and reliability after a crash. They theorized that spreading data across multiple drives could improve system performance, lower costs and reduce power consumption while avoiding the potential reliability problems inherent in using inexpensive, and less reliable, disks. Another RAID alternative is concatenation or spanning.

But as stated, no one wants to loose their data which is invaluable as compared to the cost spend for implementing RAID. This arrangement is sometimes referred to as a SLED single large expensive disk. We'll take a look right away. Hamming-code parity is calculated across corresponding bits and stored on at least one parity drive.

RAID 1 : Also known as disk mirroring, this configuration consists of at least two drives that duplicate the storage of data. Most server operating systems include some built-in RAID management capabilities. Level 5: Block interleaved distributed parity Provides data striping at the byte level and also stripe error correction information.

However, this extra protection comes at a cost. I've skipped RAID level 2 as it's not implemented these days. Thus, any read request can be serviced by any drive in the set.

raid 0
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How to Use Multiple Disks Intelligently: An Introduction to RAID