RAID

What is RAID?

RAID is an acronym for Redundant Array of Independent Disks. It is redundant system use multiple HARD drives to store your data. IF one hard drive fails your data is save and accessible. The redundant systems use all kind of critical applications were failure to be disasters. Ex: Air craft control systems, Multimedia editing, Playback that requires higher data transfer rates, and so on.

                RAID can either be built-in to the motherboard or installed as an expansion card as PCI or PCIe. Because RAID uses storage virtualization technology, regardless of the number of HDD used. The OS will only see one HDD.

                The Data is distributed across the drives in one of several ways called "RAID levels". Depending on what level of redundancy and performance is required.

There are 6 Standard levels and 3 hybrid levels. Each level providing a different balance between data reliability and input/output performance. RAID will be listed as the word with a number that identifies the level.

                The redundant system could save your business from critical data lost and therefore should be considered any data protection Scheme.

What is the common RAID terminology?

1. Mirroring

                This is one multiple disk contain identical data.

2. Striping

                Sequential block of data are split among multiple disk.

3. Fault Tolerance

                Parallely  data stored allowing data to be recovered if a problem is detected.

What are the benefits of each type?

1. RAID 0

                It is simple written multiple disks as if it want using striping. This is done improve performance by transferring data simultaneously to multiple disks. If one of the drive fails all data is lost. Useful capacity is roughly same as the physical capacity of the drives. If to be careful for no additional protection all about the speed. RAID 0 is not recommended to data protection.

2. RAID 1

                Same data send to two drives. One drive fails the data exists readily accessible another drive. Usable capacity is half to physical capacity. Ex:  if two drives 1TB and set up RAID 1 if u have 1TB usable capacity.

3. RAID 5

                Data is written across all the drives with extra information called parity. Such the data community any one of the set drives fails. RAID 5 storage devices minimum Three Drives. The Usable capacity generally be the physical capacity is one drive. Ex: If have four 1TB drives only be 3TB's is usable capacity.

4. RAID 6

                It is simply like RAID 5, the data is written across all the drives allow with the parity and information. It has double parity, so the data community with two drives fails. RAID 5 storage devices minimum FOUR Drives. The usable capacity is generally be the physical capacity less two drives.

5. RAID 10

                It is combination of RAID 0 and RAID 1. In this data is mirrored and striped across all the drives. The usable capacity has roughly the physical capacity of the drives.