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what is the purpose / power of raid

post #1 of 11
Thread Starter 
all i know is raid you connect mulitple harddrives.

but what is the true purpose of raid. and what power does raid hold?
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liger-zero
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post #2 of 11
Performance and/or redundency at various costs.

www.acnc.com/04_01_00.html
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post #3 of 11
raid 0 - two drives that give double the capacity, each piece of data broken and written into two places for easier write times

raid 1 - two drives that "mirror" - two copies of data in case one drive fails

raid 0+1 - four drives with two sets of raid 0.
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post #4 of 11
Raid 0 - Takes the speed and capacity of two hard drives and makes them one. Thus, a twice as large, twice as fast hard drive. But, If one drive goes down, they both do...

Raid 1 - Takes the data of one hard drive and mirrors it on the other one to make your data more secure. This is just like having one hard drive, but if one hard drive goes out, you still have the other one.

I think that is right. I might have them switched, so correct me someone if I am wrong...
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post #5 of 11
Thread Starter 
ok lets say you have 2 harddrives set up in raid 1, two copies.

and one fails. does the computer still function perfectly normally? also
what about that failed drive? do u just replace it and will it make a mirror copy of whats on the other drive?
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post #6 of 11
Quote:
Originally Posted by lavieinjuste View Post
Raid 0 - Takes the speed and capacity of two hard drives and makes them one. Thus, a twice as large, twice as fast hard drive. But, If one drive goes down, they both do...
I thought with raid0 you don't get any more capacity, so putting two raptor 150GB in raid0 would be faster but you could only get 150GB.
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post #7 of 11
Thread Starter 
ok so if i want to set up raid on my computer? when installing windows do i have to do the press F6 to install raid drivers or something along those lines?

or is there a setting in bios that i have to change
liger-zero
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liger-zero
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post #8 of 11
Quote:
Originally Posted by keikosid View Post
I thought with raid0 you don't get any more capacity, so putting two raptor 150GB in raid0 would be faster but you could only get 150GB.
in raid 0, both drives have storage capacity - two 150 gig raptors - 300 gigs of storage. but in raid 1, if you have two raptors, you only have 150 gigs of storage.
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post #9 of 11
RAID, courtesy of WIkipedia:
  • RAID 0: Striped Set (2 disks minimum) without parity: provides improved performance and additional storage but no fault tolerance from disk errors or disk failure. Any disk failure destroys the array, which becomes more likely with more disks in the array. The reason a single disk failure destroys the entire array is because when data is written to a RAID 0 drive, the data is broken into "fragments". The number of fragments is dictated by the number of disks in the drive. Each of these fragments are written to their respective disks simultaneously on the same sector. This allows the entire chunk of data to be read off the drive in parallel, giving this type of arrangement huge bandwidth. When one sector on one of the disks fails though, the corresponding sector on every other disk is rendered useless because part of the data is now corrupted. RAID 0 does not implement error checking so any error is unrecoverable. More disks in the drive means higher bandwidth, but greater risk of data loss.
  • RAID 1: Mirrored Set (2 disks minimum) without parity: provides fault tolerance from disk errors and single disk failure. Increased read performance occurs when using a multi-threaded operating system that supports split seeks, very small performance reduction when writing. Array continues to operate so long as at least one drive is functioning.
  • RAID 3 and RAID 4: Striped Set (3 disk minimum) with Dedicated Parity: Provides improved performance and fault tolerance similar to RAID 5, but with a dedicated parity disk rather than rotated parity stripes. The single disk is a bottle-neck for writing since every write requires updating the parity data. One minor benefit is the dedicated parity disk allows the parity drive to fail and operation will continue without parity or performance penalty.
  • RAID 5: Striped Set (3 disk minimum) with Distributed Parity: Distributed parity requires all but one drive to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive.
  • RAID 6: Striped Set (4 disk minimum) with Dual Distributed Parity: Provides fault tolerance from two drive failures; array continues to operate with up to two failed drives. This makes larger RAID groups more practical. This is becoming a popular choice for SATA drives as they approach 1 Terabyte in size. This is because the single parity RAID levels are vulnerable to data loss until the failed drive is rebuilt. The larger the drive, the longer the rebuild will take. With dual parity, it gives the array time to rebuild onto a large drive with the ability to sustain another drive failure.
post #10 of 11
Just go here: www.acnc.com/04_01_00.html

Pictures make things easier....
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