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  #11  
Old 07-24-2007, 03:45 AM
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A brief explaination is in order here.

Raid0 means striping. The short version = Half of the data on 1 drive. Half of the data on the other drive = twice the read write speed = no fault tolerance.

Raid1 means mirroring. The short version = Duplicate copies on each drive. No speed gains. Fault tolerance for single drive failure.

Raid0/1 is a combination of both, but requires 4 drives.

A Raid0 configuration is a very nice performance boost due to the fact that modern drives are relatively slow. Yes, even your super dupe mega drive is a turtle compared to the rest of the system. Yeah, even your NIC can probably kick the shit out of your drive.
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Old 07-25-2007, 08:26 AM
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Quote:
Originally Posted by Kamujin View Post
Raid0 means striping. The short version = Half of the data on 1 drive. Half of the data on the other drive = twice the read write speed = no fault tolerance.
Yet, not a huge performance improvement on typical real life gaming systems, with on-board BIOS RAID. Definitely not the 2x read/write speedup you'd expect. Still, it is a speedup, and sometimes a huge speedup depending on chipset and application. (Nothing speeds up seek times...)

Quote:
Raid1 means mirroring. The short version = Duplicate copies on each drive. No speed gains. Fault tolerance for single drive failure.
Actually, in theory you get a 2x speedup on reads, and no significant slowdown on writes. In reality, with BIOS raid you just get a slight write slowdown. What up with that? That's sad really, cause RAID1 would be a killer setup for gaming systems if it worked properly. (Cause there's really not THAT much writing involved in loading a level...)

Of course, if your game is hitting the disk a lot, it may just be time to get even more RAM, RAID notwithstanding.
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  #13  
Old 07-25-2007, 02:25 PM
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Agreed.

I tried to keep it as simple as possible to not clutter the explaination too much. There are a ton of factors that affect true RAID performance and there are a number of cheap Raid cards that can be used with a noticable improvement. Not to mention something like a Perc5.
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Old 07-25-2007, 06:58 PM
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Well since we are getting into chip sets etc. I have two chip sets available to run raid on board, the Silicon Image 3114 and the NVraid nforce 4. I should run some test and see which one preforms better.

I am sure there are some threads on google about this, but hey why not find out for yourself!
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  #15  
Old 08-03-2007, 09:21 AM
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I am running 2 Raptor 74 gigs in a RAID 0 and have been for a few years. Its fast, but thats not due to the RAID striping, mostly the spindle speed. Maximum PC did an article a few years back using DOOM 3 as their main benchmark, and they determined that a RAID 0 striped array actually increased the level load times slightly. The drives loaded the maps faster when they were running on their own instead of being RAID'ed. I'm sure the article is out there on the web but remember, its a few years old. They were figuring the bus or cpu was more of the bottle neck then so perhaps a new Core 2 Quad would show a swing in the benchmarks...
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Old 08-03-2007, 02:54 PM
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Quote:
Originally Posted by Big Kev View Post
I am running 2 Raptor 74 gigs in a RAID 0 and have been for a few years. Its fast, but thats not due to the RAID striping, mostly the spindle speed. Maximum PC did an article a few years back using DOOM 3 as their main benchmark, and they determined that a RAID 0 striped array actually increased the level load times slightly. The drives loaded the maps faster when they were running on their own instead of being RAID'ed. I'm sure the article is out there on the web but remember, its a few years old. They were figuring the bus or cpu was more of the bottle neck then so perhaps a new Core 2 Quad would show a swing in the benchmarks...
In the lastest generation of computers, the hard drives have really not kept up with improvements in every other area. So I would suggest those results would be somewhat dated in the current environment.

Also, you have to be careful not to confuse software RAID with hardware raid. All leading OS's currently support software RAID (as well as hardware), but software raid does not have the same performance benefits of hardware raid. Especially with the better hardware RAID cards.
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  #17  
Old 08-07-2007, 06:34 AM
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