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2x250gb raid0 slower than single 1tb?

post #1 of 10
Thread Starter 
all disks are Hitachi deskstar 7200rpm.
the single 1tb disk was about 120% faster than the 500gb RAID0 setup, block size 64k (vould not get any lower block size)

raid setup:
ca. 100/80mb
single 1tb disk:
ca. 130/100mb

any suggestions on how to get the RAID setup to run faster?

EDIT: the two 250gb disks are one generetion older than the 1tb disk. the 250gb disks still has molex power connectors.
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post #2 of 10
It could just be that the 250GB drives are older although I can't believe they would be THAT much slower, but I'm no expert. I do know that many older HDDs are exponentially slower than today's drives.
    
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post #3 of 10
Protip: If it has a molex connector, it is going to be pretty slow.

Also, if it has a molex connector, it more likely 2 or even 3 generations older.

Could you provide the model number of the 250gb drives? We can check online to verify their speeds.
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post #4 of 10
Thread Starter 
I also fint it hard to belive that the RAID setup could be that mucu slower. What I've done is delete the raid setup and installed windows on one of the 250gb disks. i'll run a test on it and let you know.

EDIT: @ corky: The 250gb sisks are Hitachi HDT 725025VLA380 i think and the 1tb Disk is HDS721010CLA332.
Edited by groodal - 6/14/11 at 1:04pm
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post #5 of 10
Thread Starter 
i tried to bench the disks, now i understand a lot less!
i got a write speed @ 320mb and read @ 60mb on the single 250 gb disk
the 1tb disk: 90/380mb
what is this?
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post #6 of 10
Quote:
Originally Posted by groodal View Post
i tried to bench the disks, now i understand a lot less!
i got a write speed @ 320mb and read @ 60mb on the single 250 gb disk
the 1tb disk: 90/380mb
what is this?
How are you getting 300mb+ on the read speeds?

From what I just checked, the 250gb drives are about 25% slower than the 1tb, but they should be faster in RAID than the 1tb, I am not sure what you got going on here.
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post #7 of 10
Me neither. Lots of mixed information here.
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post #8 of 10
Thread Starter 
the first speeds i've mentioned must have been mistaken! lets just forget those. but anyways the raid setup was a lot slower!
EDIT: i must have failed to remember the speeds, since i've deleted the raid setup before i wrote this post.
Edited by groodal - 6/14/11 at 3:23pm
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post #9 of 10
Quote:
Originally Posted by corky dorkelson View Post
From what I just checked, the 250gb drives are about 25% slower than the 1tb, but they should be faster in RAID than the 1tb, I am not sure what you got going on here.
35% slower. (or the 1TB is 50% faster - depends on how you prefer to look at the numbers)

And if you only compare the first 500GB of both... the average for the 1TB is probably very close to 120MB/sec. (double ) It'll also have lower seek times.

I don't think this RAID array will ever come close to that 1TB single drive.
     
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post #10 of 10
Thread Starter 
so what i sould do is installing windows on the 1tb disk instead? is it possible to simply move a windows installation from one disk to another?
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