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Raid 0 is worse! (resolved)

post #1 of 11
Thread Starter 
I was using 2x Samsung 500 GB F3's in the bench to the left. The bench on the right is a Samsung 400GB F3.




I added the 400GB drive to my RAID 0 array and the read/write speeds got worse.


The benchmark above was done after a fresh install of W7 Pro(64-bit) and installing AVG, ATI drivers, CCleaner. I also defraged. (Note: I did not install SP1)

Would windows 7 updates increase the read/write speeds that they should be? Or is it because of the 400GB HDD itself.
Edited by Shaded War - 10/25/11 at 12:42pm
post #2 of 11
RAID will always run at the speed of the slowest drive, multiplied by the number of drives.

basicly, your individual 500GB drives are significantly faster than your 400Gb drive, so your 400Gb drive is slowing down the raid.
    
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by corhen View Post
RAID will always run at the speed of the slowest drive, multiplied by the number of drives.

basicly, your individual 500GB drives are significantly faster than your 400Gb drive, so your 400Gb drive is slowing down the raid.
The 400GB drive was 7200RPM. How come it is slowing it down?

On neweg it lists that it has the same specs as the 500GB drives. Only difference was the 100GB.
Edited by Shaded War - 10/24/11 at 7:56pm
post #4 of 11
RPM =/= Read and Write Speeds. It can depend on many factors, including the drive's firmware and also the quality of the head that reads the data from the magnetic platters.
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post #5 of 11
Thread Starter 
Ok thanks for clarifying. I was hoping I could get my array over 300Mb/s Read/write for BF3. Guess I will just have to go back to my 2x 500Gb array.
post #6 of 11
Quote:
Originally Posted by Shaded War View Post
Ok thanks for clarifying. I was hoping I could get my array over 300Mb/s Read/write for BF3.
Don't worry, a RAID array or SSD would only decrease loading times, thats all
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by xPwn View Post
Don't worry, a RAID array or SSD would only decrease loading times, thats all
Thats what I wanted it for.
post #8 of 11
What are you using for your array? Is it a dedicated raid card, or an on-board controller?

I don't have benchmarks on-hand, but I know as of a couple years ago, many on-board raid controllers really didn't do well with more than a couple drives at a time.

Software raid is even worse (but I'm guessing you're at least using on-board?).

Quote:
Originally Posted by xPwn View Post
Don't worry, a RAID array or SSD would only decrease loading times, thats all
Not necessarily. In larger and larger games that use more and more complex textures, it's very often that during a game or entering a new game area on the same level, new textures are pulled from the game data stored on the drive, which does show up as momentary slow-downs in gaming. But I think that's something better addressed by low seek times of SSD's, and not as much by raid arrays.
    
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post #9 of 11
Lol, its the 400gb drive. You don't add different sized drives to a raid 0 ever. Bad things will happen to you.
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post #10 of 11
Quote:
Originally Posted by JedixJarf View Post
Lol, its the 400gb drive. You don't add different sized drives to a raid 0 ever. Bad things will happen to you.
Why not? the size of a drive doesn't matter for RAID0, and as long as there isn't a problem with the controller, there's no reason why adding a third drive of any sort would drastically decrease read and write times just by virtue of the fact that the drives are asymmetric in size. JABOD's has worked fine for raid0 for a long time.

You're just losing 100GB from each of the 500GB disks.
    
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