RAID Data Recovery
Commonly referred to as a RAID, this term stands for: Redundant Array of Independent Disks.
A RAID stores the same data in different places. What does that mean? It means better failure protection and higher operating levels. Input/output operations can work simultaneously, staying balanced, increasing performance levels. RAID is a way to combine multiple single disks, that may be cheaper, into one larger higher functioning drive.
RAID 0,1,2,3,4,5,6 Data Recovery
How does RAID work?
RAID functions by using disk mirroring and disk striping techniques. This involves partitioning each individual drives storage space into sections which can be anywhere from 512 bytes (a sector) up to multiple megabytes. Click here if you are interested in learning more about mirroring and striping.
Common RAID Levels
There are a quite a few different RAID levels to choose from depending on your needs.
The most common RAIDS are: RAID 0, RAID 1, RAID 5.
Uncommon RAID Levels and How They Work
Other levels you may run into would include:
- RAID 2 – uses striping across disks and has error checking and correcting operations
- RAID 3 – also uses striping with one drive especially for parity and is best used with a single user system
- RAID 4 – is based on large stripes which enables you to read of any disk
- RAID 6 – is similar to RAID 5 only with a branch specially for parity which is more expensive and can slow things down. You may also hear about nested RAID levels. This is simply referring to a combination of other RAID levels.
RAID 0 is there to offer fast performance speeds. The disks are set up in such a way that the data is distributed throughout the different disks, in what is referred to as the striping mode. Although RAID 0 has very good performance speed it does not offer good failure protection. If drive failure happens to occur, there is no data redundancy, so chances of recovery are low.
RAID 1 creates data written identically into different disks of a drive, which is referred to as mirroring. It allows any data to be accessed from any of the disks in the drive. It improves read performance, seeing as any data can be read from different disks, but the write throughput is the same as with single disk storage. The drive will remain to work as long as there is still one good drive in it.
RAID 5 provides both data redundancy and speed. RAID 5 writes to multiple disks and therefore can read from multiple disks. It requires at least three disks but will perform better if five disks are used. The performance of RAID 5 is better than a regular disks but may not be as good as a RAID 0 depending on what you are looking for. Because of the way the RAID 5 reads and writes it may not be your best option for a system the is write-intensive.
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