There are a variety of typical RAID levels from RAID 0 to RAID six.
RAID 0: stripes the data across a set of drives but should you shed a drive you shed almost everything RAID 1: mirrors the data to a further disk normally in mirrored pairs of two RAID 3: stripes the information and includes a drive just for parity RAID 5: distributes information and parity across the drives in case you shed one RAID six: distributes data and doubles the parity permitting for a two drive failure One of the most frequently employed configuration is RAID 5. So that you can understand what RAID is you need to recognize how the hard drives perform inside your laptop or computer or externally in an enclosure. So as to possess a RAID configuration you'll need a minimum of 3 tough disks. For our purposes we are going to be using 5 really hard drives in our configuration. The computer system must have a RAID controller inside the laptop on the motherboard in order to connect the difficult drives. The other solution is always to have an external RAID enclosure to hold the tough disks. With five disks in the configuration every single block of information is being written and spread across these five drives writing a marker (parity bit) in case there's a loss of one of those drives. In the event of a drive failure the remaining four drives carry the load using the parity bit so it truly is not noticed by the end user on the personal computer. The parity bit keeps track of errors as each block of information is written to the really hard drives. Within the case from the loss of a second drive that could be catastrophic even for any RAID 5 configuration to manage. Normally RAID devices have LEDs around the drive enclosures that glow red in case of drive failure. The RAID unit manufacturer ought to offer alerting application which will operate along with your operating system as well as the program log to notify you of a failure also. After the failed drive is replaced the RAID unit will rebuild the data around the new drive re-establishing the RAID five set just like new. Recovery from the drive failure along with the subsequent rebuild method could take quite a few hours and will degrade the efficiency of the laptop till completed. Raid on motherboard is accessible from a couple of manufacturers. Though not popular in desktop PCs there are actually choices allowing you to set up external RAID enclosure with minimal effort. Find out additional info raid 6 recovery
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