| Redundant Arrays of Inexpensive Disks
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| | Enhanced Performance
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| (RAID) was introduced to increase the
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| | Improved performance can be found in
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| level of storage, redundancy and
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| | specific versions of RAID and this
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| augmented performance in enterprises and
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| | performance depends upon the number of
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| server markets, but now have become much
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| | drives used in the array and the
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| common with an end user over the past 5
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| | controller. Different RAIDs when
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| years.
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| | implemented provide superior performance
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| In simple terms, RAID can be defined as a
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| | in their own way and up to different
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| combination of number of low cost hard
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| | levels, but all improve in some way or
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| drives linked together to form a single
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| | the other.
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| large capacity storage device with
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| | Lower Cost
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| improved performance, high storage
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| | When RAIDs were introduced, the cost of
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| capacity and reliability of data storage.
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| | implementing them became a key issue. The
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| Use of RAID storage technology came into
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| | invention of RAID was to provide greater
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| significance in late 1980s and has marked
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| | storage capacity as compared to use
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| its presence as the in-demand data
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| | individual high storage capacity device.
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| storage medium for corporates,
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| | Difference in the cost of high and low
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| professionals, manufacturing units and
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| | capacity drives can be analyzed with a
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| individual users for their need of high
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| | good example where three drives of small
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| capacity data storage device.
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| | size cost less than an individual high
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| Generally three forms of RAID are used
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| | capacity drive which provides more
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| for desktop computer systems - RAID 0,
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| | capacity.
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| RAID 1 and RAID 5.
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| | Data Security
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| RAID 0 is the lowest level of RAID. This
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| | The data which is stored on array is
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| level fails to provide any level of
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| | completely secured as RAID provides
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| redundancy for the data stored in array.
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| | complete security and competence to
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| If any of the drive fails, all the data
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| | protect the data. This security is
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| is damaged.
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| | followed even if the complete hard disk
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| RAID 1 provides simple form of redundancy
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| | fails without any data loss or performing
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| for data with the help of mirroring
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| | the restoration process of the backed up
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| process. This RAID level has two
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| | data. All RAID levels provide same degree
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| individual drives with same capacity. One
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| | of data security.
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| is the active drive and the second is
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| | Improved Accessibility
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| secondary drive termed as mirror. When
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| | Accessibility refers to availability of
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| data is written to the active drive, it
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| | data. RAID provides its users to recover
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| automatically gets copied to the mirror
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| | data from hardware faults without any
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| drive.
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| | problems.
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| RAID 5 is the most powerful and effective
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| | Disadvantages of RAID:
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| level of RAID used on desktop computer
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| | RAIDs do give an assured security to the
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| system. It requires hardware controller
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| | computer systems but this security cannot
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| card to manage the array but in some
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| | be relied upon for long time. If your PC
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| desktop operating system it can be done
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| | gets attacked by virus, or files and
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| through software.
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| | folders are deleted or your PC hits the
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| A minimum of three drives are required to
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| | floor or is affected by the fire - water
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| build RAID 5 array with similar drives
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| | damage leads to such situations where you
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| for best performance.
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| | don't have any other option other than
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| Other levels of RAID levels are RAID 0+1,
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| | opting for RAID data recovery services.
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| RAID 10 or 1+0, software and hardware
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| | There have been many cases when more than
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| RAIDs which are used for the storage of
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| | one drive has failed causing an expensive
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| data.
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| | RAID data recovery.
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| Advantages of RAID:
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| | Like such cases, anything is possible and
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| Redundancy
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| | constant backups should be maintained to
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| Redundancy becomes the most important
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| | avoid data loss situations even if you
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| feature while developing the RAID server
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| | are using any reliable storage medium.
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| environment. Redundancy is required in
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| | Conclusion:
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| means of performing backup of data in
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| | It is agreed that RAID provides PC users
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| situations of drive failure in the array.
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| | with a number of benefits depending upon
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| Capacity
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| | the version implemented. High storage
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| By combining multiple small drives into a
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| | capacity, security, accessibility,
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| large array, capacity to store large
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| | performance are the key features which
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| amount of data increases. The data
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| | attract users to opt for RAID. The
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| storage capability of the operating
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| | advantage of one RAID level over the
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| system increases as the RAID server is
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| | other cannot be measured as for some
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| installed thus providing you the freedom
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| | applications RAID 5 is better than RAID 0
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| to store any amount of data which gets
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| | and for some RAID 0 would be superior to
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| restricted while using the limited size
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| | RAID 5.
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| drives.
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|
