want to know what RAID is ?

Hi ,
i need a very good explanation what raid is ?
how it comes in the hardware way and in the software way ?
and an explanation about the raid types will be appriciated too


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Scroll down to see RAID levels

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victorbxAuthor Commented:
what are the diffrences between the software version and the hardware version if there is any ?

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Kyle SchroederEndpoint EngineerCommented:
Software RAID is controlled by the operating system and device drivers to perform the RAID function (i.e. writing duplicate information to both disks of a RAID-1 array).  The OS knows it is working with RAID.  Using hardware-based RAID, the OS doesn't know that there is a RAID card sitting there that is doing the real work of striping/mirroring/etc, it looks at the array as a single drive and lets the hardware (RAID card, etc) deal with the details.


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Is RAID only a fault tolerant for data or can it also protect operating system and Weblogic?
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