RAID architecture?

What is RAID architecture? What are its advantages?
rituaAsked:
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dumbscottyConnect With a Mentor Commented:
Go to www.webopaedia.com and search on it if it's not listed in the top 10 queries. I'd recommend bookmarking this site as I've found it really useful for technical information.

Good luck.
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rituaAuthor Commented:
Give the answer as soon as possible. Thanx.
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gormenghastCommented:
Hi
RAID stands for "Redundant Arrays of Independent Disks".
This means that instead of having your data stored on individual disks which could fail and result in loss of data, you stripe your data across several disks with parity information so that should one drive fail all the data can be recreated.
There are different levels of RAID from RAID 0 to RAID 5, these have different ways of dealing with parity excepting RAID 0 which is simple disk striping they all allow for 1 of the disks to fail without losing data.
RAID 5 is the most common which distributes its parity information over all disks.
RAID 3 is disk striping with a dedicated parity drive
RAID 2 is simple disk mirroring.

Hope this helps
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rituaAuthor Commented:
Thanx for the site info. It is a reall...y good site and I got the info needed. Thanx for the comment too.
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SilasCommented:
There is a difference between a software-based RAID system and a hardware-based RAID system.  Windows NT 4.0 can use RAID levels 0,1,&5, but it is up to OS to keep track of all the parity information and file structures.  A hardware-based system consists of a SCSI controller card with an on-board processor, that can be independantly configured to construct an array.  In this scenario, the controller card keeps track of the array, and the drives become "hot-swapable."  If one drive fails, it can be replaced, and the data will be auto-regenerated.  To NT, the array will appear as one large drive.  The OS will not have to keep track of any parity information, and perfromance will improve.  It is always better to go with a hardware-based RAID solution, but it is more expensive!
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