Questions on Setting up Raids 0 & Performance

3 replies [Last post]
Dominic I
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Joined: Jul 11 2001

I am setting up a Raid 0 using the folllowing

6x Hitachi Deskstar SATA300 250GB 7200rpm 8MB cache
32.9-67.8mbyte/sec sustained
Adaptec/Dell AHA 2610 6 port raid card SATA150

This card is on a PCI 64 bit 100Mhz slot set to PCI-X

My questions:

1. should the PCI slot be set to PCI-X or PCI 2.2, which is faster?

2. On the card it gives me stipe size options 16, 32, 64 KB (64 is dafault), which should i use and which would be the fastest?

3.At the moment I'm getting High 60'sMB/sec with the drives on Raid 0, set as a Dynamic drive in XP. Should it be running fatser than this, i know that the 150MB/sec on SATA150 and 300MB/sec on SATA300 are unachivable

4. What sort of figures should be achivable, i am thinking of installing another of these card on the remaining 100MHz pci slot and having 5 drives on each card, would i see much better performance by adding drives or by reducing the amount of drives per card.

Idealy i need to get a sustained data rate of 132MB/sec with upto 12 drives, i'm not to bothered if i only get that sort of datarate upto 30-50% drive capacity as long as i can get somthing.

Dominic

Dominic, OB- Mac mini '13, Final Cut Studio 2, KA-Sat, UltraStudio 4K, HyperDeck Studio, QuickLinks, Teradek 
www.iirisat.tv

Stuart B-M
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Joined: Apr 6 2001
Dominic I wrote:
I am setting up a Raid 0 using the folllowing

6x Hitachi Deskstar SATA300 250GB 7200rpm 8MB cache
32.9-67.8mbyte/sec sustained
Adaptec/Dell AHA 2610 6 port raid card SATA150

This card is on a PCI 64 bit 100Mhz slot set to PCI-X

My questions:

1. should the PCI slot be set to PCI-X or PCI 2.2, which is faster?

2. On the card it gives me stipe size options 16, 32, 64 KB (64 is dafault), which should i use and which would be the fastest?

3.At the moment I'm getting High 60'sMB/sec with the drives on Raid 0, set as a Dynamic drive in XP. Should it be running fatser than this, i know that the 150MB/sec on SATA150 and 300MB/sec on SATA300 are unachivable

4. What sort of figures should be achivable, i am thinking of installing another of these card on the remaining 100MHz pci slot and having 5 drives on each card, would i see much better performance by adding drives or by reducing the amount of drives per card.

Idealy i need to get a sustained data rate of 132MB/sec with upto 12 drives, i'm not to bothered if i only get that sort of datarate upto 30-50% drive capacity as long as i can get somthing.

Dominic

In part answer to question one, pci-x is the latest so imagine it would be 'faster',

Question 2
http://www.storagereview.com/guide2000/ref/hdd/perf/raid/concepts/perfStripe.html

Kind Regards

Dominic I
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Joined: Jul 11 2001

Thanks for that.

I think with 6 drives i should be able to set it to it's min i.e 16 KB i'll let you know what performance gains i get.

So thats questions 1 & 2 answered, can anyone throw some light on the other two.

Regards

Dominic

Dominic, OB- Mac mini '13, Final Cut Studio 2, KA-Sat, UltraStudio 4K, HyperDeck Studio, QuickLinks, Teradek 
www.iirisat.tv

PaulD
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Joined: Aug 31 2002

Hi
Since I'm getting 75MB/s write, 58MB/s read on a single Maxtor 250GB SATA media-storage drive in my G5 Mac, with 180GB of movie clips stored on it, you aren't seeing any significant RAID 0 benefit. This would be the case if your benchmarking software is using tiny files to do the checking with.

Common sense (ie guessing) would suggest that with a PCI-X bus speed of 133MHz - which a 6-channel RAID setup could saturate, adding a second RAID card only makes sense if your motherboard has a second seperate PCI-X buss for the other slot.