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The different types of RAID levels are RAID 0, RAID 1, RAID 3, RAID 5 & RAID 10 levels. RAID 0, STRIPING: In this system, the data which is to be written across the drivers are split up in blocks of array. RAID 0 will offers a superior Input Output performance and the performance can be increased further by using multiple controllers. The advantage of using RAID O is that it offers great performance such as read and write operations.
The Disadvantage of RAID 0 is not fault tolerant. If at all the data in one of the disk is lost then all the data in the RAID 0 array will be lost. RAID 0 is designed for non critical storage of data where read and write are at a high speed. For example, it can be used in the PhotoShop image retouching station. RAID 1, MIRRORING: In RAID 1, the data is stored twice on the data disk and on a mirror disk. If one of the disk fails, the controller uses the data drive or the mirror drive for RAID recovery.
The advantages of using RAID 1 are excellent read speed and a write speed which is very high comparable to that compared to a single disk. If one of the disks fails, data is copied to the replacement disk. RAID 1 is a very simple technology compared to RAID O. the disadvantages of RAID 1 is that the storage capacity is half of the total disk capacity which is present in the system because all data get written twice. RAID 1 is ideally suited for mission critical storage. It is also suitable for small servers. RAID 3: In RAID 3 systems, the data blocks are divided into and are written in parallel on two or more drives.
The additional drive which is used to stores parity information. Since parity is used in RAID 3 stripe set can handle a single disk failure without losing data. The advantages of RAID 3 are to provide high throughput for large data transfers. The disadvantage of RAID 3 is complex and performance is slower for small Input Output operations. RAID 5: RAID 5 is the most common used RAID level. It is some what similar to RAID-3 in which data is transferred to disks by independent read and write operations. RAID 5 array can withstand a single disk failure as in RAID 3, without losing data. Extra cache memory can be provided in order to improve the write performance.
The advantage of RAID 5 is it reads data transactions are very fast. The disadvantage of RAID 5 is disk failures and this is complex technology. RAID 10, A mix of RAID 0 and RAID 1: RAID 10 uses the advantages of RAID 0 and RAID 1 in a single system. Its added advantage helps in proving good security by mirroring all data on a secondary set of disks. The RAID 2, 4, 6 or 7 levels do exist in prepress environments. The advantages of RAID 10 are read data transactions are very fast & it is a very simple technology. The disadvantages of RAID 10 is that is its performance is slower for large transfers.
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