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RAID 3 Explained

RAID 3 is a type of a RAID lesser level. It provides redundancy to three or more than three drives by writing all the data to them. RAID 3 disk array gives storage for video imaging, streaming, publishing applications or any system requiring large file transfers. Its implementation is done by the RAID parity levels. In some special areas, in spite of its disadvantages, it offers very high storage efficiency.

There is a combination of RAID striping and parity in RAID 3, the only difference being that it puts all the information of the parity on a separate disk for parity. The result is that RAID 3 recovery is suited poorly for applications involving transactions.

How does RAID-3 operate?

In the RAID 3 mode, the information which is stored in the form of the bytes of data are alternated between every drive in the array excepting one of them. The byte is saved to each drive and the RAID 3 controller uses the data in order to calculate the parity information and store that on the drive dedicated to it. In a RAID 3 array, odd bytes are placed on the first drive, even ones on the second and the bytes of parity are placed on the third drive and so on.

Each drive in the array can perform or operate parallely meaning that more than a byte is stored at a given instant unlike an orthodox hard drive that involves waiting for a byte to be recovered before it can start retrieving the second byte. The advantage is that this can increase the throughput two times that when a conventional hard disk drive is used. RAID 3 needs at least three disks, one for parity and two for data as quoted above and a controller.

Raid 3 recovery:

Using a RAID 3 level of array, the data block is striped or subdivided and is written on the data disks. The parity is generated on Writes, recorded on the parity disks and checked on Reads. Some of the advantages of RAID 3 data recovery are that it offers a very high read data as well as write data transfer rate. The disk failure is highly insignificant on the throughput. The ratio of Parity disks is low which implies RAID 3 recovery is highly efficient.

The main idea of using a RAID 3 for RAID recovery array is to get a high performance system. RAID 3 data recovery helps in recovering all your corrupted, lost or damaged data from the system.

Why is RAID data recovery needed?

When one drive in the array fails, there would be the failure of the entire RAID 3 array. Some common causes of RAID 3 data loss are:

  1. RAID controller failure.
  2. Lost, damaged or corrupted RAID array configuration.
  3. Improper formatting.
  4. Conflict in the hardware.
  5. Rebuild errors.

Data raid recovery is possible even though it depends on the nature of the damage caused.

Why is RAID partition recovery needed?

Partitions may sometimes get corrupted leading to several volumes of disks getting vanished, system not booting up with messages similar to missing partition table, free space areas getting disappeared in the disk manager, etc. The key to missing partitions is to know the sizes and the locations of the corrupted or vanished volumes.

A RAID 5 controller supports sparing and rebuild, implementing RAID 3.

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