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performance of DDO overlay stripe vs. dedicated controller

Posted on 2003-10-27
Medium Priority
Last Modified: 2010-04-03
Hello all, thanks in advance for the help from you pros, I have searched high and low for an answer to no avail...

i am doing a build of a NLE video system using a Compaq Evo w6000 (dual 2ghz xeons). My integrated ide channels are free so I thought I'd use that to build a raid0 or 0+1 using winXP Pro. After much research at compaq/hp, it seems I would have to rely on a drive manufacturers DDO driver overlay to use >137mb drives.

So my question is this: Is this a bad idea in terms of cpu efficiency compared to a regular pci ide-raid controller? This is realtime video and so the two most important factors are drive throughput as well as CPU for transitions and RT effects. I would rather not eat up a slot if I have what it takes integrated on the mobo, but drive speed and cpu is really quite important. Thanks for any advice.

part two of this might be to ask if anyone has any experience with samsung drives. I understand they run cool, quiet and have 3 year warranties, a rarity nowadays.
Question by:eno_nyc
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LVL 32

Expert Comment

ID: 9629887
Still not sure what you're asking for, but I assume you want to compare software RAID against hardware RAID. I can assure you hardware RAID is faster as it doesn't consume processor power (it does, but in hardware RAID it has is own processor to do the calculations)

Also about the >137mb drives. <= Gb I assume
This won't be a problem with windows or any operating system, it would be a problem to your BIOS or IDE controller, If you want to use drives bigger than 137Gb you should look for a bios update or an IDE controller that supports those big drives.

> part two of this might be to ask if anyone has any experience with samsung drives.
I personally didn't have any experience with samsung drives, but WD still have 3 years warranty and they're producing drives a lot longer so I assume they know how to make relyable drives. Samsung is a newcommer on this marked.



Author Comment

ID: 9630040
thanks for the quick reply... no, i guess my question is not about hardware vs. software raid. my concern is more about DDO requiring overhead that I should be worried about. I would assume that a dedicated raid card with a modern bios would be a slam dunk. But do you know if the resources needed for the DDO overlay is negligable or not? i have no experience with software LBA addressing. i am worried that going with something like "data whiz" (seagate i think) or "data lifeguard" (western digital, maybe i have them mixed up) to get me over the 137gb hump "in software" will give me less than desirable results in my stripe. I'm basically looking for the speed of raid0 without losing a PCI slot in a system that offers no help in getting over the 137gb barrier.

Thanks again. appreciate it.
LVL 32

Accepted Solution

LucF earned 300 total points
ID: 9630223
I'm sorry to say that I don't have experience with DDO (I'm not an expert, but I try to help)

> I'm basically looking for the speed of raid0 without losing a PCI slot in a system that offers no help in getting over the 137gb barrier.
This is an easy task for any recent IDE-RAID controller, You'll have to check your manual if your motherboard supports this. You should know that the 137 barrier is not an software but an hardware barrier (not completely true, the hardware has to be able to address those drives (wich software does))


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