RAID is the short form of Redundant Array of Independent Disks. In order to get upgraded speed and performance, several physical disks are integrated as one set. Different levels of RAID types: RAID 0, RAID 1, RAID 5, RAID 6 and RAID 10.
Different levels of RAID processing
It is the initial level to process. In a RAID 0 system data is written to disks in the array as different blocks. Performance can be enhanced by using several disks at once. There are different controllers, one controller per disk, which is used to increase performance. RAID 0 can be used to combine two drives storage into a single volume. RAID 0 is supported on Linux, OS X, and Windows. The benefit of RAID 0 is that one disk failure does not affect the data of the second disk.
In this data is stored in two drives one is data reader and the other one is a mirror drive. In case of failure of one drive the other drive is used for data recovery and operated. We need a minimum of 2 drives for RAID 1 array.
It is the regular level of RAID process. In RAID 5 we need minimum 3 disks which can work for 16 blocks. The disks are divided into data blocks and every disk has the equal part of the data block written. The data is dispersed over all drives instead of writing on a single drive. The computer can determine the data from another block of the set in case of data unavailability. Which means that RAID 5 array supports single disk failure without any data loss. In RAID 5 a hardware controller is suggested even it is identified in software. To increase the performance of writing, the extra cache can be used.
RAID 6 is equal to RAID 5 but the same data is written on two disks. This means to support 2 disks we need 4 disks. If the 2 disks are lost another 2 can be used. Unlike the RAID 5 in RAID 6, the array can survive on the second failure. In RAID 5 one disk fails, replacing with a new one takes time, during this if another disk fails data may be lost forever.
The benefits of RAID 0 and RAID 1 can be grouped to a single system. The mirroring of all data on secondary disks while using each disk set can speed up data transfers and also provides security.
Several mirrors are created where the data is arranged in tapes on multiple disks, later extracted disk sets are mirrored. RAID 10 level has fault tolerance which is equal to RAID 1 with advancing read or write speeds on a single RAID 1 volume. In this RAID 10 level, 4 disks are needed.
For any business, data is the key resource. Data loss may result in business loss. Keep the regular back up to save some effort to access or to protect in case of drive failures. Using RAID along with storage configurations can be an economical way to secure and access the data.
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