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Understanding RAID

post #1 of 23
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While there are a few situations which may require the use of RAID at home, they are few and far between. There are of course many situations where it isn’t necessary, but it can provide various benefits. As disk capacity grows, more and more important data gets thrown onto our hard drives and a disk failure can cause a serious headache. Protection against data loss in the event of a disk failure can be invaluable, and RAID can provide a great deal of peace of mind.

From a performance point of view however, RAID doesn’t make much of an argument for desktop use. Sure, you may save a second when loading a game, but the same time could be saved by upgrading your CPU or memory. Fact of the matter is, unless you’re doing some pretty hardcore graphics, audio or video work, the performance potential of RAID doesn’t mean much.

The biggest difference you’re likely to notice is when running disk benchmarks that have little or no bearing on real world performance. It’s all balancing act between the level of performance needed, the level of redundancy required and the cost of implementation as to whether RAID is worth using, and which level of RAID is the best choice.
Quote:
I hope that you've enjoyed this look into RAID and found it helpful. More importantly, I hope it de-mystifies some of the confusion surrounding the technology. Whether you decide that RAID is right for you or not, it's good to have an understanding of what you can really expect from each of the different types.
Cool article http://www.bit-tech.net/hardware/200...tanding_raid/1
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post #2 of 23
hmmm..!?..interesting.
but isnt raid0 supposed to double performance?
    
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post #3 of 23
I bought RAID specifically for two reasons.

A) Booting windows time cut in half... literally.
B) Loading up PDFs.... time cut down to less than half. That's all I need to want to buy it.
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post #4 of 23
I just needed more disc space so I decided to just RAID my harddrives while I were at it... instant performance upgrade + double harddrive space
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post #5 of 23
Quote:
Originally Posted by pang786 View Post
hmmm..!?..interesting.
but isnt raid0 supposed to double performance?
RAID0 with two hard drives doubles theoretical I/O performance. Server environments benefit more since there are literally thousands of random requests need. Even the most multitasking desktop user cannot simulate the randomness or number of requests made on a server. Also, RAID0 does not reduce seek time and there is a processing overheard. In reality, a server might get a something like a 60% performance gain per HD while desktop users gain 10%.
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post #6 of 23
Quote:
Originally Posted by DuckieHo View Post
RAID0 with two hard drives doubles theoretical I/O performance. Server environments benefit more since there are literally thousands of random requests need. Even the most multitasking desktop user cannot simulate the randomness or number of requests made on a server. Also, RAID0 does not reduce seek time and there is a processing overheard. In reality, a server might get a something like a 60% performance gain per HD while desktop users gain 10%.
That still depends... during large file transfers you can feel it.
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post #7 of 23
I'm thinking about setting up a raid configuration just to save my files in case my hd fails completely. If there is any performance added it would just be a plus. I have a 160G right now, but I don't ever think I'll ever use 1/4 of that. Could I use lets say a 80G hd along with it or would they need to be the same size and/or model? Right now I have a sata hd so I'm sure I would use that type, but other than that, I have no idea what to use.
Sorry about the noobness of the question
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post #8 of 23
Quote:
Originally Posted by gonX View Post
That still depends... during large file transfers you can feel it.
True, but how often do most users do large file transfers? Also, you only feel it if the file transfer is from a RAID0 to another fast HD or vice versa. If not, the non-RAID hard/flash drive would be the bottleneck. In addition, is the transfer time reduced by 50%?
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post #9 of 23
I have to disagree with the home benefits to raid, I noticed several improvements when I added the second drive and went raid0, boot time was drastically reduced, and as for large file transfer how many of us have spent time watching windows "copying files", this time was also reduced with the addition of the raid0.
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post #10 of 23
Quote:
Originally Posted by DuckieHo View Post
True, but how often do most users do large file transfers? Also, you only feel it if the file transfer is from a RAID0 to another fast HD or vice versa. If not, the non-RAID hard/flash drive would be the bottleneck. In addition, is the transfer time reduced by 50%?
Quote:
Originally Posted by Urufu_Shinjiro View Post
I have to disagree with the home benefits to raid, I noticed several improvements when I added the second drive and went raid0, boot time was drastically reduced, and as for large file transfer how many of us have spent time watching windows "copying files", this time was also reduced with the addition of the raid0.
There you have it... the average home user--yes, but when I do things like video editing, it certainly is something you can feel.
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