Introduction to raid | comparison of various Raid levels.
In this Article we will be learning about Raid, Raid types and comparing various Raid levels and also, we will be covering the advantages and disadvantages of Raid.
Introduction to RAID
RAID is a technology used to increase performance and / or reliability of data storage. The abbreviation represents the Redundant Array of Independent Drives or the Redundant Array of Inexpensive Disks, which are older and less commonly used.
The RAID system contains two or more identical drives. These can be hard disks, but there is a tendency to reuse SSD (Solid State Drives) technology. There are different levels of RAID, each designed for a specific situation. This is not placed on an industry team or consolidation committee. This explains why companies sometimes come up with their own unique numbers and performance.
Many RAID standards use a debugging system called “parity”; a method widely used in information technology to provide error tolerance to a given data set.
Fig 1: Real life view of Raid
Most use a simple XOR, but RAID 6 uses two different parities depending on the combination and duplication of a particular Galois camp or the Reed-Solomon error correction.
RAID can also provide data security with solid-state drives (SSDs) at no cost to the entire SSD system. For example, a fast SSD can be modeled with a mechanical drive. For this adjustment to provide the maximum speed benefit a proper controller is required that uses a fast SSD for all learning activities. Adaptec calls this “hybrid RAID”.
Types of RAID
RAID can be used as hardware (control card or chip) or software (software-only or hybrid) by storage managers.
Hardware RAID:
· Dedicated hardware controller provides Hardware-based RAID services. IT can install Hardware RAID in two ways: an external RAID Controller Card or an internal RAID-On-Chip.
Software RAID:
· Software-based RAID provides RAID host services. RAID software has two flavors: pure software defined by OS performance, and hybrid software that contains part of the hardware to reduce CPU load.
Use of RAID
The growing demand for storage and data around the world, the organization’s main concern is to go beyond protecting its data. This does not mean security from unsafe threats, rather than from hard disk failures and other incidents that could lead to file destruction. Today, in these cases, RAID plays magic by providing unwanted and the opportunity to recover all your data in a timely manner.
Advantage of RAID
The obvious advantage of using RAID configuration is the ability to drive drivers at large volumes. However, as more drives are used, the data can be stored in such a way that it can be transferred to multiple disks, so data can be accessed by disks simultaneously, greatly improving data access times.
Disadvantage of using RAID
Using too many drives is dangerous. The chances of a single drive failing to get out of multiple drives are much higher than those of a single failure. This leads to a greater chance of losing data on your disks. There are, however, ways to reduce the effect, or make it more reliable than using single disks.
There are many Raid levels let’s take a look at some:
RAID levels:
RAID 0 — Striping
RAID 1 — Mirroring
RAID 2 — Hamming Code
RAID 3 — Byte level striping
RAID -Block level striping with a dedicated parity disk
RAID 5 — Striping with parity
RAID 6 — Striping with double parity
RAID 01 — Mirror of stripes
RAID 10 — Combining mirroring and striping
In the case of hardware or software, RAID is available for most applications or for RAID speeds. The most commonly used categories are RAID 0, 1, 5, 6 and 10 RAID 0, 1 and 5 apply both to HDD and SSD media. (RAID 4 and 6 standards still apply to all media, but are not widely used in practice.)
Conclusion
RAID is the ultimate and most effective system for improving the speed of applications for installing applications and distributing back to work to ensure data security. RAID 0 is best suited for applications that require faster data streaming. RAID5, RAID1 + 0 and RAID 0 + 1 are suitable for applications that require a combination of fast and fast system. RAID 1 is best for applications that are not too fast but require high data integrity.