Very nice description beefy, understand it better myself now.
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| what the hell is RAID? http://forum.gamecommunity.co.uk:8080/viewtopic.php?f=6&t=50295 |
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| Author: | moo [ Sat Apr 05, 2008 12:34 pm ] |
| Post subject: | what the hell is RAID? |
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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| Author: | Skrunk =GCHQ= [ Sat Apr 05, 2008 1:22 pm ] |
| Post subject: | Re: what the hell is RAID? |
Its a method of configuring multiple hard drives http://en.wikipedia.org/wiki/RAID |
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| Author: | LeBeourfCurtaine [ Sun Apr 06, 2008 12:22 pm ] |
| Post subject: | Re: what the hell is RAID? |
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). |
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| Author: | moo [ Sun Apr 06, 2008 1:19 pm ] |
| Post subject: | Re: what the hell is RAID? |
Far to complicated for me. I'll just stick to putting disks in and clicking 'yes'. |
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| Author: | gemma=GCHQ= [ Sun Apr 06, 2008 4:07 pm ] |
| Post subject: | Re: what the hell is RAID? |
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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| Author: | Stealth [ Sun Apr 06, 2008 4:25 pm ] |
| Post subject: | Re: what the hell is RAID? |
Very nice description beefy, understand it better myself now.
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