Perfect RAID Recovery

Data division and replication, these are the two basic processes used in RAID. Though there are multiple disks, but all these are considered and treated as single disk by the operating system.

Based on different data storage schemes, various RAID levels have been standardized. From RAID 0 through RAID 6, there are different schemes which offer appropriate solutions for data protection, performance and reliability. Different nested levels are also implemented like RAID 0+1, RAID 5+0, RAID 5+1 and so on.

When one or more RAID drives fail, it requires different recovery solutions for different RAID arrays. Such RAID Recovery solutions depend upon the nature of failure that is whether logical or physical drive failure. RAID 0 includes multiple disks in which data striping is performed without redundancy but no fault tolerance. Striping is a technique that spreads blocks of each file across multiple disk drives. Fault tolerance is an engineering design technique that enables a system to continue operation, generally at a reduced performance level rather than failing completely, when a critical system component (like system software) or the whole system (a hardware or software RAID based RAID array here) fails. If any of the RAID drives fail, then all data in the RAID 0 array is lost. So, failure of even a single RAID 0 drive requires RAID Data Recovery.

RAID 1 uses two storage industry leading techniques to offer better storage reliability than RAID 0 along with Fault Tolerance:

i.) Disk Mirroring: A technique which applies simultaneous writing of data to two
duplicate disks to ensure complete data safety. In this manner, if one hard
drive fails, the system can quickly switch to the other hard drive without
loosing any data or halting any service. Disk mirroring is generally used
in database servers and on-line database systems like of banks to meet the
data accessibility requirements round the clock.

ii.) Disk Duplexing: It involves writing data on two separate disks within the same RAID array. It is an extension of mirroring technique and offers the same data safety with each hard drive in the RAID array connected to its own controller as the main advantage.

Thus, RAID 1 can remain operational as long as even a single RAID 1 hard drive is functional in the array. RAID 1 fails when the drive suffers physical failure. Commonly it happens due to reasons like wear and tear of the moving components and hard drive fatigue. For RAID 1+0, failure of multiple hard drives can be taken care of (if logical in nature) until no two failed drives are mirrored to each other.

The frequently used RAID 5 array can tolerate one hard drive failure and decrease the probability of RAID Recovery. This is because in this case distributed parity can help rebuilding the array.

In any of the RAID arrays, what values the most is that the data remains intact and always accessible. RAID Data Recovery experts are known for their service to recover lost data from almost all modern RAID arrays. These experts are well versed of RAID data storage systems, hard drive internals and rigorous recovery mechanisms. The failed RAID hard drives need to be shipped to RAID Recovery Company, where advanced software and hardware procedures are safely applied to extract the data.