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Why is RAID so fast? - Page 3

post #21 of 37
Quote:
Originally Posted by DuckieHo View Post
So wrong. This is not even close to being accurate. Saying this is like saying a Core 2 Duo at 3GHz is a 6GHz processor.


Two Caviar's in RAID0 would provide faster overall speeds. However, a single Raptor will still have a better seek time (but this is less important)
My apologies, I completly described not what I was thinking. It will in fact be faster to use RAID, but your right, it doesn't "increase" the seek times.
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post #22 of 37
Duckie, please don't dumb people down when someone is not 100% right.
You say "So wrong. This is not even close to being accurate."
While this is true - He said "theoretically." Meaning he knows it isn't 100% true.
Bringing the fact that you have TWO 7,200 RPM drives instead of one 10,000 RPM drive to their attention is a good way to explain the idea behind the speed for someone that doesn't understand the subject. You need to reference something that you know they already understand.
There is really no way to know what the RPM equivalent would be, as far as I know.

Colts. Yes, the Raid 0 will be faster overall.
Duckie spoke of seek time, and yes, each drive is still only SEEKING @ 7200RPM, so it will take a bit less to seek. The Raptor is ~ 4.6ms and a standard 7200RPM is ~ 8.5ms. Big difference really, but then realize you are only talking a difference of 3.9ms... do you know how long 3.9ms is? lol exactly!
    
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post #23 of 37
Quote:
Originally Posted by dpawl31 View Post
Duckie, please don't dumb people down someone is not 100% right.
You say "So wrong. This is not even close to being accurate."
While this is true - He said "theoretically." Meaning he knows it isn't 100% true.
Bringing the fact that you have TWO 7,200 RPM drives instead of one 10,000 RPM drive to their attention is a good way to explain the idea behind the speed for someone that doesn't understand the subject. You need to reference something that you know they already understand.
There is really no way to know what the RPM equivalent would be, as far as I know.
But it is still not even close to being correct. Spindle speed is only one aspect of performance. Firmware, data density, and platter count all have a very large impact on performance. It is better to provide correct information now than correcting all the misinformation later.

Also, "theoretically" is different than in "simplified terms" or "in laymen's terms". RAID0 should theoretically double your performance in some aspects but it has nothing to do with spindle speed at all.
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post #24 of 37
Quote:
RAID0 should theoretically double your performance in some aspects but it has nothing to do with spindle speed at all.
If you had two 5k RPM drives vs a single raptor... and the 5k drives had the same other specs as 7200 drives, you would have equivelent spindle speed but still less performance. So how does spindle speed not have anything to do with performance at all?

*edit* I meant to say the raptor has more performance. Didn't clarify that.
    
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post #25 of 37
Quote:
Originally Posted by dpawl31 View Post
If you had two 5k RPM drives vs a single raptor... and the 5k drives had the same other specs as 7200 drives, you would have equivelent spindle speed but still less performance. So how does spindle speed not have anything to do with performance at all?

*edit* I meant to say the raptor has more performance. Didn't clarify that.
Spindle speed has nothing to do directly with RAID. Hard drive performance is what RAID0 improves. Hard drive performance is derived from spindle speed, firmware, data density, and platter count.

Barracuda 7200.10 in RAID0 vs Caviers SE in RAID0. Spindle speeds are the same. Who wins? 7200.10. Why? Barracudas have better performance.
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post #26 of 37
Heh, you guys needn't keep fighting over my incorrect description, I said theoretically to basically get across the fact that it should operate at twice the speed of a single 7200 rpm drive. Obviously connecting drives together doesn't make the spindle spin faster, but allows you to collect or write a fixed size of data faster then on a single raptor.
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post #27 of 37
Quote:
Originally Posted by DuckieHo View Post
Spindle speed has nothing to do directly with RAID. Hard drive performance is what RAID0 improves. Hard drive performance is derived from spindle speed, firmware, data density, and platter count.

Barracuda 7200.10 in RAID0 vs Caviers SE in RAID0. Spindle speeds are the same. Who wins? 7200.10. Why? Barracudas have better performance.
I didn't say that spindle speed was the only factor in raid performance.
But you just said it yourself, it IS a factor.
    
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post #28 of 37
Lol, I was just going to point out the same flaw in his arguement.
post #29 of 37
Quote:
Originally Posted by dpawl31 View Post
I didn't say that spindle speed was the only factor in raid performance.
But you just said it yourself, it IS a factor.
When you look at RAID... don't look at spindle speed. Don't add spindle speeds. Spindle speed does not matter in RAID. You look at spindle speed to help judge the performance of a HD. So yes, RAID does not care about spindle speed and spindle speed should not be mentioned.
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post #30 of 37
I give up. Not worth it. Duckie HAS to be right!
    
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