Raptors in Raid 0 ?

[Magnusfarce]

The bit of research I've done suggests that a pair of Raptor HDD's set up in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

- Magnusfarce

 

[DevilsPGD]

In message <[email protected]> "Magnusfarce"

The bit of research I've done suggests that a pair of Raptor HDD's set up in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

I've seen this here -- I suspect the issue is that the drives are
already approaching the ability of the controller to keep up. I might
be way off though.

 

[Bill's Dead]

The bit of research I've done suggests that a pair of Raptor HDD's set up
in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

- Magnusfarce

Your research would appear to be flawed.
http://www.anandtech.com/storage/showdoc.aspx?i=2101&p=5

 

[John Doe]

The bit of research I've done suggests that a pair of Raptor HDD's
set up in a RAID 0 array does not increase their net speed by very
much. Is this true, and if so, why?

From reading, my understanding is that it depends on your usage,
like random access versus sustained transfer or something like that.
I might ask in the storage group. Good luck.

 

[DevilsPGD]

In message <[email protected]> "Bill's Dead"

Your research would appear to be flawed.
http://www.anandtech.com/storage/showdoc.aspx?i=2101&p=5

Benchmarks vs realworld usage seem to disagree in this case, although I
can't discount the SATA controller as the limiting factor in my last
test.

 

[aj]

The bit of research I've done suggests that a pair of Raptor HDD's set up in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

- Magnusfarce

Onboard cache gets disabled during RAID which kills a big part of the
benefit of that drive. Getting a controller with large cache should
solve that.

 

[Terry]

Your research would appear to be flawed.
http://www.anandtech.com/storage/showdoc.aspx?i=2101&p=5

This page shows a 20% performance improvment in "pure disk
performance". If you click on the next-page button at the bottom, you
get to a "real world" test, which shows a 3.6% performance improvement
for RAID 0 over non-RAID. The OP's research seems to have been
confirmed.

Terry

 

[John Weiss]

The bit of research I've done suggests that a pair of Raptor HDD's set up
in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

The speed increase is real and discernable. However, I don't think it is
worth the added risk of data loss.

After having to rebuild mine due to corruption of 1 of the disks, I went to
RAID 1.

 

[DevilsPGD]

In message <[email protected]> aj

Onboard cache gets disabled during RAID which kills a big part of the
benefit of that drive. Getting a controller with large cache should
solve that.

huh? -- The drive doesn't know or care that you're using a RAID
controller. Caching on the controller will definitely help, but the
drive's cache shouldn't be affected one way or the other.

 

[Conor]

The bit of research I've done suggests that a pair of Raptor HDD's set up in
a RAID 0 array does not increase their net speed by very much. Is this
true, and if so, why?

PCI bus transfer.

Can't shift data faster than the PCI bus will allow.

 

[DevilsPGD]

In message <[email protected]> Conor

PCI bus transfer.

Can't shift data faster than the PCI bus will allow.

A single Raptor can't exceed the PCI bus' theoretical bandwidth limits
though, other then when bursting (which doesn't count), so in theory,
RAID-0 should still help.

In practice... It doesn't

I'm probably going to try again on my new GA-K8NXP-SLI, it has an SATA
controller on the PCI-E bus, which might be a bit more fun

 

[sbb78247]

The speed increase is real and discernable. However, I don't think
it is worth the added risk of data loss.

After having to rebuild mine due to corruption of 1 of the disks, I
went to RAID 1.

you pussy - that is what imaging and a disaster plan is for - live life tase
death

 

[John Doe]

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From: "sbb78247" <sbb78247 stilldon'tfuckincare.invalid>
Newsgroups: alt.comp.hardware.pc-homebuilt
Subject: Re: Raptors in Raid 0 ?
Date: Fri, 28 Oct 2005 23:46:50 -0500
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you pussy - that is what imaging and a disaster plan is for - live life tase
death