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moo
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Post subject: what the hell is RAID?  Posted: Sat Apr 05, 2008 12:34 pm |
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| Bow down to the master |
Joined: Sat Jun 19, 2004 8:24 pm
Posts: 1233
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looking at the scan website...some of thier systesm include an option for a RAID card..what on earth is it?
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Skrunk =GCHQ=
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Post subject: Re: what the hell is RAID? Posted: Sat Apr 05, 2008 1:22 pm |
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| In youz forumz bein youz Pepsiz |
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Joined: Wed May 23, 2007 5:52 pm
Posts: 1804
Location: Poland
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Its a method of configuring multiple hard drives http://en.wikipedia.org/wiki/RAID_________________  Diablo-X =GCHQ= wrote: you need to improve your jokes, making them funny is crucial,
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LeBeourfCurtaine
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Post subject: Re: what the hell is RAID? Posted: Sun Apr 06, 2008 12:22 pm |
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| Decidedly uninterested |
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Joined: Thu Mar 18, 2004 11:10 pm
Posts: 10184
Location: I watch you while you sleep
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RAID is basically about spreading your data across several disks. You can use RAID to safeguard your data, or speed up disk access.
RAID 0 - If you want speed you set up striping of data across disks, so that the data is read from 2 or more disks at the same time, effectively halving the access time (loading data twice as fast).
To safeguard data you can use a number of methods:
RAID 1 - You can duplicate data by writing the same thing to 2 separate disks. This means that you effectively lose the use of one disk. Have one disk fail, however, and your data is safe on the other.
RAID 3/4 - Like RAID 1, but using several disks. Instead of each disk having the same data on it, you split the data up and put different parts of it across different disks, making more efficient use of the space. One disk is used as the index and so you only lose the effective use of one disk, instead of all bar one. You then add a replacement disk and rebuild the data on it from the index. Lose the index and you recreate it from the data (I think).
RAID 5 - As above but with the index split across each of the disks instead of confining it to one disk (Most common).
RAID 6 - Dual index allowing the loss of 2 disks, used mainly for high availability systems. Two disks are effectively lost for data use.
You then get various combinations such as 1+0 (mirrored then striped), 0+1 (striped then mirrored), 5+0 ('efficiently mirrored' then striped).
_________________  The Pancreas of S.T.F.U. | Never take life too seriously - nobody gets out alive anyway. Disco_jim: um..... I have no excuse. | Chips: Thank the Beef | Rev Dr: Beef, I think i wee'd a little
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moo
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Post subject: Re: what the hell is RAID? Posted: Sun Apr 06, 2008 1:19 pm |
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| Bow down to the master |
Joined: Sat Jun 19, 2004 8:24 pm
Posts: 1233
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Far to complicated for me. I'll just stick to putting disks in and clicking 'yes'.
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gemma=GCHQ=
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Post subject: Re: what the hell is RAID? Posted: Sun Apr 06, 2008 4:07 pm |
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| Made in Taiwan |
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Joined: Sun Apr 11, 2004 9:14 pm
Posts: 3549
Location: Bonneville salt flats.
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LeBeourfCurtaine wrote:
RAID 0 - If you want speed you set up striping of data across disks, so that the data is read from 2 or more disks at the same time, effectively halving the access time (loading data twice as fast).
I am pretty sure the access time (time taken to start recieving data) stays the same if not slightly slower than a single disk (Due to sync'ing period) but the throughput as you say can approach double that of a single disk.
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Stealth
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Post subject: Re: what the hell is RAID? Posted: Sun Apr 06, 2008 4:25 pm |
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| Bow down to the master |
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Joined: Thu Sep 08, 2005 5:52 pm
Posts: 1502
Location: Perth, UK
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Very nice description beefy, understand it better myself now. 
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