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Slow RAID 0 Burst Performance

post #1 of 9
Thread Starter 
My System:

Asus A8V Deluxe
AMD Athlon 64 3800+ X2 Dual Core
1.4 GB DDR 2100
2 x Seagate Barracuda 80GB 7200RPM in RAID 0 on onboard Promise FastTrak 378 SATA RAID controller
1 x 200GB Seagate drive as backup on the second onboard SATA controller (VIA VT8237 DriveStation SATA RAID Controller)

My problem:

I ran HD Tach yesterday and was shocked at the results...

Burst speed 52.0 MB/s
Average read 46.1 MB/s

The rest seems ok though...

Random Access 12.8 ms
CPU Utilization 1% (+/-2%)

Also, I tried a real world test by copying 1.04 GB of videos folder to folder on the same raid set. It took about 65 secs. I then tried the same test with the same videos on the standalone 200gb drive and it took 5 secs less! I know 200gb drives are quicker than 80s, but in a raid 0 config, 80s should at be at least as fast, if not faster than my 200.

It looks like the read speed is being limited by the burst speed, but what is limiting the burst speed?

Thanks for any advice.
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post #2 of 9
Yeah, there's definately a problem with both the burst and average read. I got 275MB/s burst and 128MB/s average read with my array on the onboard raid. Can you fill out your system specs so we can help you better?
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post #3 of 9
Quote:
Originally Posted by Fishie36 View Post
Yeah, there's definately a problem with both the burst and average read. I got 275MB/s burst and 128MB/s average read with my array on the onboard raid. Can you fill out your system specs so we can help you better?
Must be working on it as we speak Fishie...LOL
Welcome IronBut !!!!
Doesn't seem like you are Raided homie...those are normal numbers for the harddrive...oops!!
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post #4 of 9
What is the stripe size for your array? Generally you should use 16 as the "norm" unless you're always going to be working with very small or very large files.
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post #5 of 9
Thread Starter 
Sorry just got back from a job.

Asus A8V Deluxe
AMD Athlon 64 3800+ X2 Dual Core
1.4 GB DDR 2100
2 x Seagate Barracuda 80GB 7200RPM in RAID 0 on onboard Promise FastTrak 378 SATA RAID controller
1 x 200GB Seagate drive as backup on the second onboard SATA controller (VIA VT8237 DriveStation SATA RAID Controller)
Nvidia 6600GT AGP 256mb
DVD-RW + CD-ROM
SoundBlaster Live! Player 1024 PCI card
2 Port Trust PCI USB 2.0 card
MM100 PCTV card
500w PSU
15-in1 Card reader
and a floppy drive

I cant remember what stripe size i chose. I just went with the default whatever that was. I have tried to find it by going into RAID bios but cant see it. I'm not even sure if it let me choose stripe size, only performance or security. Nothing in the motherboard manual about stripe sizes for the Promise controller, but there was for the VIA. I am thinking of changing to the VIA controller and moving the backup drive to the Promise.

What i did find in RAID bios was:-

Mode - 2+0 Stripe
Size - 160052M
Track - Mapping 19458/255/63
Status - Functional
Drive models are both ST380817AS
Mode - U6 (UDMA 6)

Also, i have no jumpers in the drives.
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AthlonXP 3800+ X2 Asus A8V Deluxe Geforce 6600GT 1.4 GB DDR2100 
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2x80GB Seagate 7200RAID 0 XP Pro LG Flatron L1715S DeluxWorld 
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2x80GB Seagate 7200RAID 0 XP Pro LG Flatron L1715S DeluxWorld 
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post #6 of 9
Thread Starter 
oops i just saw wot u meant by filling out specs lol here we go again...
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My System
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post #7 of 9
If its raid 2 thats probably your problem. RAID-2: Hamming code error correction. RAID-2 uses the same hamming encoding method for checking the correctness of disk data that error correcting code memory (ECC) uses. You should have it set to Raid 0 for stripping, Raid-2 looks like some sort of error correcting raid.
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post #8 of 9
Thread Starter 
Quote:
Originally Posted by Dman View Post
If its raid 2 thats probably your problem. RAID-2: Hamming code error correction. RAID-2 uses the same hamming encoding method for checking the correctness of disk data that error correcting code memory (ECC) uses. You should have it set to Raid 0 for stripping, Raid-2 looks like some sort of error correcting raid.
I see so 2+0 = ECC + Striping I thought it meant 2 drives in raid 0. It never told me i was going to get ECC added on and I definately chose optimize for performance. Well the Promise raid seemed the most powerful of the two controllers, but now im changing my mind. Ill try C-bro's 16k stripe suggestion when i change to the VIA controller.

But wouldn't that halve my disk capacity if i had parity bits on each byte? Maybe i shouldnt go that far into it
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
AthlonXP 3800+ X2 Asus A8V Deluxe Geforce 6600GT 1.4 GB DDR2100 
Hard DriveOSMonitorKeyboard
2x80GB Seagate 7200RAID 0 XP Pro LG Flatron L1715S DeluxWorld 
PowerCaseMouse
ATX 500W Old one.. Too small Microsoft Wheel Mouse Opt 
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My System
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CPUMotherboardGraphicsRAM
AthlonXP 3800+ X2 Asus A8V Deluxe Geforce 6600GT 1.4 GB DDR2100 
Hard DriveOSMonitorKeyboard
2x80GB Seagate 7200RAID 0 XP Pro LG Flatron L1715S DeluxWorld 
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ATX 500W Old one.. Too small Microsoft Wheel Mouse Opt 
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post #9 of 9
Quote:
Originally Posted by ironbut View Post
I see so 2+0 = ECC + Striping I thought it meant 2 drives in raid 0. It never told me i was going to get ECC added on and I definately chose optimize for performance. Well the Promise raid seemed the most powerful of the two controllers, but now im changing my mind. Ill try C-bro's 16k stripe suggestion when i change to the VIA controller.

But wouldn't that halve my disk capacity if i had parity bits on each byte? Maybe i shouldnt go that far into it
The two most common raids are:

0 - Striping - 2+ drives, 2X+ bandwidth, 2X+ burst, 1X total drive capacity
1 - Mirroring - 2+ drives, 2X+ bandwidth, 2X+ burst, .5X total drive capacity
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