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Raid
In this document I will explain Raid and what they are used for. Today in the IT world most companies have a raid setup for the sample fact if something happen to the system they will have a backup in place down time is not tolerated. Raid are mostly found on servers not on desktops but there are a few set up that can work on desktop computers.
Definition: Raid (redundant array of independent disk, originally redundant array inexpensive disk) is a way of storing data in multiple drivers all at the same time. By placing data on multiple disks, I/O (input, output) operations can overlap in a balanced way, thus improving performance. Since multiple disk increases the mean time between failures (MTBF), storing data redundantly also increases fault tolerance.
Raid 0: Is two drivers that are treated as one with both drives used simultaneously for storing data on different portions of the same data this method is also called striping. Striping will boost performance but the down side to it you can also lost all your data if the drive fails and with that said DONT USE STRIPING FOR DATA DRIVES.
Raid 1: Raid 1 starts off the same way as raid 0 but is a little different in the configuration and the set up for raid 1 mirrors all the data from the other drive make it immediately reflected of the other drive. Mirroring provides built-in back-up backup method and provides faster read performance than a single drive. This way is good for data backup.
Raid 0+1 (10): is raid 0 and raid 1 all wrapped in one to combine as one. A better example is that four drivers combine striping plus mirroring for extra speed plus better reliability. Suitable for use with program and data drivers. This can also be used in an array.
Raid 5: raid 5 is three 3 or more drivers and those drivers are treated as logical array and information also used in case of a crash to recover data that may be lost because data is spread across all drives in the array.
RAID-6: This type is similar to RAID-5 but includes a second parity scheme that is distributed across different drives and thus offers extremely high fault- and drive-failure tolerance.
RAID-7: This type includes a real-time embedded operating system as a controller, caching via a high-speed bus, and other characteristics of a stand-alone computer. One vendor offers this system.
RAID-10: Combining RAID-0 and RAID-1 is often referred to as RAID-10, which offers higher performance than RAID-1 but at much higher cost. There are two subtypes: In RAID-0+1, data is organized as stripes across multiple disks, and then the striped disk sets are mirrored. In RAID-1+0, the data is mirrored and the mirrors are striped.
RAID-50 (or RAID-5+0): This type consists of a series of RAID-5 groups and striped in RAID-0 fashion to improve RAID-5 performance without reducing data protection.
RAID-53 (or RAID-5+3): This type uses striping (in RAID-0 style) for RAID-3's virtual disk blocks. This offers higher performance than RAID-3 but at much higher cost.
RAID-S (also known as Parity RAID): This is an alternate, proprietary method for striped parity RAID from EMC Symmetrix that is no longer in use on current equipment. It appears to be similar to RAID-5 with some performance enhancements as well as the enhancements that come from having a high-speed disk cache on the disk array.

Donte Brown

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