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RAID 5 Performance benefits

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Phixzet

Limp Gawd
Joined
Nov 9, 2005
Messages
196
Hey folks.

I'm having some trouble quantifying the read and write performance benefit from using a hardware raid 5 card. I have read Tom's article - but that seems to concentrate on I/O's per second - but I'm also interested in raw (sustained/burst) transfer speeds. (I have been searching specifically though for info on the card I expect to buy - the Areca 1220 - assuming I can finda n SLI MB with a PCI 8X slot in adddition to the two 16X slots, the second one of which I'd like to reserve for a video card if possible)

Can someone point me in the right direction?
 
You're right... I did see this yesterday - I dismissed it because the cards reviewed are PCI-X. I should however read it for the overall performance benefits, something that didn't hit me until you mentioned it :)
 
I have an Areca 1220 running in my 2nd PCIe 16x slot.

Here are some HDTach results for RAID0, not done any RAID5 benches yet.

wd raptor bench.PNG

4x WD Raptor 74GB RAID0


hitachi bench.PNG

4x Hitachi Deskstar 7K500 RAID0
 
Fuzzb,
I hate to tell you this.....
But that's 2 different runs on the same array.

Areca ARC-1220-VOL#00 R001
Click to expand...

But it's still an incredible set of numbers. 4ea. 74GB Raptors - WOW!!!
And 4ea. 7K500's

That's like US$2500.00 worth of drives - not counting the ARC-1220

Are you trying to compete with Doug on hard drive space?

 
rodsfree said:
Fuzzb,
I hate to tell you this.....
But that's 2 different runs on the same array.



But it's still an incredible set of numbers. 4ea. 74GB Raptors - WOW!!!
And 4ea. 7K500's

That's like US$2500.00 worth of drives - not counting the ARC-1220

Are you trying to compete with Doug on hard drive space?

Click to expand...

Well spotted :) I will re-run HDTach tonight.

Who is Doug btw, and how much HDD space does he have? :)
 
I'm Doug, see sig. I don't have any awesome flagships like 7K500s, more of a motley crew. Those Areca numbers look good, although you are brave man to run 4x RAID-0 with 2TB of data.
 
Sorry to hijack, but I currently own 2 74gb raptors on raid 0, would the performance be THAT great to buy 2 more?

(i'm considering upgrading my computer this holiday season)
 
Awesome synthetic bench results != awesome application level performance. Yes 4x WD740GD will deliver awesome transfer performance, but load times will not be significantly shorter for applications/windows/games, certainly not 75% shorter. At best, you will see an improvement of 10-15. Many applications will see no improvement at all over a single WD740GD.
 
DougLite said:
I'm Doug, see sig. I don't have any awesome flagships like 7K500s, more of a motley crew. Those Areca numbers look good, although you are brave man to run 4x RAID-0 with 2TB of data.
Click to expand...

Yup I certainly am and it is a risk, but I backup that drive on a nightly basis. RAID1+0, 3, 5, 6 is great for data availability but shouldn't be used as a replacement for data backups.

I just rebenched the WD Raptors and Hitachis:

WD Raptor Bench 2.PNG


Raptors

Hitachi Bench 2.PNG


Hitachis
 
Those are weird-looking graphs - did you do the "short" or the "long" test? I would've expected the Hitachis to keep up to the Raptor in terms of STR.

 
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