what is RAID 3?
RAID 3 is a striped RAID level made to supply a efficiency improve by storing sequential bytes of data across a number of disks. In contrast to RAID , which also provides a speed boost, RAID 3 supplements the speed boost with the use of a parity bit to boost data integrity.
RAID3 is a technique utilised to combine a number of disk drives into a single volume with a committed parity disk. In a RAID3 program, information is split up into a quantity of bytes that are written across all the drives in the array except for 1 disk which acts as a committed parity disk. This indicates that disk reads from a RAID3 implementation access all disks in the array. Performance can be enhanced by employing multiple disk controllers. The RAID3 array gives a fault tolerance of 1 drive, while providing a capacity of 1 – 1/n times the total capacity of all drives in the array, where n is the quantity of difficult drives in the array. Such a configuration is largely appropriate for storing data of bigger sizes such as multimedia files.
At least 3 physical difficult drives are required to create a RAID3 array. Every disk should be of the identical size, considering that I/O requests are interleaved to read or create to a number of disks in parallel. Also, due to the nature of RAID3, the quantity of drives must be equal to 3, 5, 9, 17, and so on, or 2^n + 1.
This section demonstrates how to produce a computer software RAID3 on a FreeBSD system.
RAID 3 is a RAID configuration that utilizes a parity disk to retailer the information generated by a RAID controller as an alternative of striping it with the data.
Because the parity data is on a separate disk, RAID 3 does not perform properly when tasked with quite a few small data requests. RAID 3 is a far better selection for applications that have extended sequential data transfers, such as streaming media, graphics and video editing.