What is raid ?

RAID: Redundant Array of Independent (or Inexpensive) Disks. Type of disk, often used on servers, where several physical disks are combined into an array for better speed and fault tolerance.
Level 0 implements data striping where file blocks are written to separate drives. Does not provide fault tolerance, because failure of one drive will result in data loss.
Level 1 implements data mirroring. Data is duplicated on two drives either through software or hardware. Provides faster read performance than a single drive.
Level 2 - not used in practice. Data is split at bit level at written to multiple drives.
Level 3 - requires at least 3 drives. Data block is striped at byte level across drives and error correction codes (parity info) is recorder on another drive. Provides fault tolerance but slower writing performance.
Level 4 - Similar to Level 3 but provides faster performance because it uses blocks for striping.
Level 5 - Similar to Level 4 but improves performance but also striping parity info across multiple drives.
Level 6 - Similar to Level 5 but also uses second parity scheme for better fault tolerance.
Level 7 - Proprietary RAID design by Storage Computer Corporation. Faster than other levels because it uses multiple levels of cache and asynchronous I/O transfers.
In addition multiple RAID levels can be combined to improve performance or reliability.

That one i alwasy heard..but never knew this much about it...thanks man....for the good addon knowledge.

raid??????

Hi guys

In 1987, Patterson, Gibson and Katz at the University of California Berkeley, published a paper entitled "A Case for Redundant Arrays of Inexpensive Disks (RAID)" . This paper described various types of disk arrays, referred to by the acronym RAID. The basic idea of RAID was to combine multiple small, inexpensive disk drives into an array of disk drives which yields performance exceeding that of a Single Large Expensive Drive (SLED). Additionally, this array of drives appears to the computer as a single logical storage unit or drive.
The Mean Time Between Failure (MTBF) of the array will be equal to the MTBF of an individual drive, divided by the number of drives in the array. Because of this, the MTBF of an array of drives would be too low for many application requirements. However, disk arrays can be made fault-tolerant by redundantly storing information in various ways.
Five types of array architectures, RAID-1 through RAID-5, were defined by the Berkeley paper, each providing disk fault-tolerance and each offering different trade-offs in features and performance. In addition to these five redundant array architectures, it has become popular to refer to a non-redundant array of disk drives as a RAID-0 array.


Thanks for all friends

still didn't get what the hell this raid si,,,,,,,,,,,,?

Nice info and is really interesting. Thanks!

but now a days after arrival of new SATA drives makes this technique more reliable and worth able.
this makes the new generation computer in the market

Raid is Short for Redundant Array of Independent Disks, a class of dicks drives that apply two or added drives in aggregate for accountability altruism and performance. RAID disc drives are acclimated frequently on servers but aren't about all-important for claimed computers. RAID allows you to store the same data redundantly in a balanced ay to improve overall performance.

To know more about RAID Drives; just follow the below URL of wikipedia. I am sure you will get the answer rest of your all questions related to RAID.

I searched in google and then found out that only there are 6 raid levels and we have 01,10 raids.
So, from does level from ? Is it 10 or 01 or something else ?