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My RAID5 array VS OCZ Vertex 2, Is this right???

post #1 of 10
Thread Starter 
Using the sig rig with OCZ Vertex 2 and 3 Seagate barracuda 7200.12 HDDs in RAID5 via onboard intel. OCZ Smokes it in write... but WTH? HDDs get 210 read?

Is this right? and what program should i be using to test accuratly, i saw this program on lifehacker so i tried it...

    
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post #2 of 10
Sounds about right. I have an identical RAID5 to you and I see pretty much the same performance. It's mainly because RAID5 is the shiz.

You have to realize RAID5 is distributed parity, if using drives that are intended for RAIDing (like the 7200.11 and 7200.12, RE4 drives, etc) a rule of thumb is 3 drives ~ 2.5x the performance of one drive - assuming you have a CPU to backup a firmware RAID controller like what's on your mobo. A full on RAID card will get it closer to the 3x mark. Effectively RAID 5 writes 1/3 of the file to each of the three drives, plus the parity data in case of failure. With a good CPU or a dedicated RAID card, these parity writes don't slow you down a whole lot when compared to a straight RAID0 setup.
Edited by CTRLurself - 8/22/11 at 10:32am
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post #3 of 10
Thread Starter 
So in reality will this be faster than my SSD for boot/opening apps etc? right now the raid5 is storage and the ssd is boot and a few apps.
    
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post #4 of 10
Quote:
Originally Posted by iCrap View Post
So in reality will this be faster than my SSD for boot/opening apps etc? right now the raid5 is storage and the ssd is boot and a few apps.
Yes and no.

You will likely have stability issues with RAID5's for an OS drive unless you're careful with them do to constant read/writes for the OS itself to run. Unstable ultimately is slower, even if it's faster in the short term.

Running programs off it isn't as bad. I have set up systems with some programs running off a RAID5 with the OS on another drive. If you have to reinstall the OS you'll have to delete these files before you re-install the program, not a big problem at all, and you will have a performance boost depending on your SSD for sequential reads/writes, but RAIDs do not have good random speeds compared to an SSD.
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post #5 of 10
Thread Starter 
Ok well i plan to do SSD for boot and most apps, the RAID5 is for storage for my pictures, videos, movies and steam games/other games. will this work fine? also i have the entire thing backed up to another external drive because i don't trust hard drives..
    
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post #6 of 10
A SSD will still be faster than ANY RAID array for a boot drive because of one simple concept - Random Access Time.

It doesn't matter how quick your read spead is (ok... I suppose if you had a read of over 9000, excuse the meme, it might actually be somewhat faster to boot up, but it still wouldnt be as responsive) if you are spending half of the time seeking for the files to begin with.

As for putting games on the RAID. Sure.. just don't put Minecraft on it if you play that. Far far too many slow writes. Disk drives are horrible at writes to begin with and RAID 5 is even more terrible at writes. :< The SSD would make Minecraft snappy as heck... but unless you mod it, it'll kill your ssd pretty quick. *shrug* up to you to decide what you want to do with that.
Edited by Zero4549 - 8/22/11 at 11:19am
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post #7 of 10
Quote:
Originally Posted by iCrap View Post
Ok well i plan to do SSD for boot and most apps, the RAID5 is for storage for my pictures, videos, movies and steam games/other games. will this work fine? also i have the entire thing backed up to another external drive because i don't trust hard drives..
Yeah, that will work fine. Mine is ONLY movies and TV shows on it. All my programs are on a WD black drive which is fast enough for me... for now.

The thing to remember is a RAID is NOT a backup, it's redundancy. A redundant setup protects you from down-time due to hardware failure (which is what a RAID does). A backup keeps files in two separate, non-related locations. If you delete a file it will still be in your backup of that drive, but on a RAID it is gone - because changes propagate automatically in RAIDs.
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post #8 of 10
Thread Starter 
Ok thanks.

The thing is i have had HDD's fail before so i just don't trust anything without redundancy... (1hdd, or raid0 for example) so i keep it in at least 2 places.... and at the moment its, on the raid array, on an external backup, on a network backup.
    
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post #9 of 10
I have just about the same exact setup as you, except I am using 2 Crucial M4 64GB in RAID 0 for my OS. Basically all I store on my SSD array is my OS and applications. On my RAID 5 I have all my DATA and Games. I even moved most of my user profile data to the RAID 5 such as My Documents, Download, and Pictures folders. So far I have not seen any issues running in this config and am quite happy with the speed and performance of everything.
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post #10 of 10
I get 180 mb/s on those same drives (two of them 7200.12).
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