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Setting up RAID 0 on 2 unpartitioned HDDs, use striped or spanned?

post #1 of 12
Thread Starter 
So I have two 2TB drives on a new build. I have downloaded the RAID controller and verified it is there in my device manager. I have also setup RAID in my BIOS for the SATAs (SATAs 1-4).

Now I need to partition the drives. I right click on the unpartitioned drives and I get four choices.

New Simple
New Spanned
New Striped
New Mirrored

If I understand what I have read I need to choose either Spanned or Striped for RAID0. Is this correct? And if so, what is the difference? I plan to use the two drives for gaming and programs. I have an SSD in IDE mode I use for my OS.

Another unrelated question. I have SATAs 1-4 set in RAID mode in my BIOS, and have SATAs 5 and 6 in IDE. All spaces are used other than 1 of the RAID SATAs.

If I want to add a new hard drive to this SATA, what can I do to make it it's own unique hard drive? This is my first time trying to play with RAID so I do not know the implications. Is it even possible to have it setup as it's own unique drive, when the other three RAID SATAs are taen up by two HDDs and a DVD drive? Or can I just choose 'New Simple' on this new HDD and it will not interfere or clash with the two I am trying to setup here in RAID0?
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post #2 of 12
Thread Starter 
Or am I just going about this incorrectly from the start? I do not have experience setting up RAID volumes
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post #3 of 12
I'm sure you have to use striped, and with 2 2tb drives, I would think it's best to do a different raid configuration or no raid at all.
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post #4 of 12
Thread Starter 
What do you mean by 'best to do a different raid configuration'? As in I should not do RAID 0 at all?
If so why not?

I actually just finished partitioning the drives using Strpied. I have 3.63 TB of space. I am confused - I thought doing RAID 0 would mean I would lose half the space but gain speeds?)
Edited by mkohanek - 3/10/11 at 8:04pm
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post #5 of 12
no. no you don't lose space, you just can't back it up in RAID 0. If one drive fails in RAID 0 the other drive(s) lose their data. If you look at the bottom of this http://www.salvagedata.com/raid/raid-101/ Raid 1 would be the best if you want to raid, but since you've already partitioned your drives, just keep it that way. As long as one of your drive's doesn't fail, you're good/
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post #6 of 12
Thread Starter 
I see what you are talking about. I still get double speed on reads, but no gain on writes so that should still be OK for gaming. Plus I won't be in trouble if one drive fails.

Thanks, I think I will do that. +rep

Just to be sure - I am guessing I need to do 'New Mirrorred...' to setup RAID 1?

Here is a new question...

If I have these drives setup in RAID 1, what would happen if I installed a third 2 TB drive and used the RAID 1 drives plus the new one for RAID 0. Do you have a link that explains the implications of that?
Edited by mkohanek - 3/10/11 at 8:27pm
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post #7 of 12
I think you're confusing things a little.

If you have properly set up your RAID array it will appear as a single volume in Windows, not as separate drives. You should select 'New Simple Volume' when you format.

If your drives show up as separate in Windows then you haven't set up an array in your RAID controller BIOS. You should do this before you boot into Windows - a prompt will appear telling you to press Ctrl + (some letter - forget which is default for AMD) during the boot - do this and you will get to the utility to set up your arrays.

If you use the 'New Striped' option you will get a RAID0 software array instead, which has some downsides to using your BIOS (like the arrays aren't bootable etc).

RAID1 also does not offer double the read speeds of a single drive, mainly due to physics (a drive can't read alternate sectors any faster than it can read sequential sectors - the limiting factor is the platter spinning). In fact on many controllers only a single drive is used for reads anyway, or at best the drive that responds first is used (so you may get a slightly better access time.
post #8 of 12
beast is right, you won't get double the speed through any raid configuration, but you will get more speed, he's also right about seeing one drive, RAID 0 will turn both of your drives into one, you should see this in windows after you are done. http://en.wikipedia.org/wiki/Standard_RAID_levels it says "theoretically double read speeds"
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post #9 of 12
Quote:
Originally Posted by peacepcf;12691512 
beast is right, you won't get double the speed through any raid configuration, but you will get more speed, he's also right about seeing one drive, RAID 0 will turn both of your drives into one, you should see this in windows after you are done. http://en.wikipedia.org/wiki/Standard_RAID_levels it says "theoretically double read speeds"

he wasn't talking about RAID0 (at that point) - he was talking about RAID1. Many people (including the link posted in this thread) assume that this gives a read boost as you could read half the data from each disk. Sadly it just doesn't work with mechanical drives, and you end up with comparable speeds to a single drive (some things are slightly faster, others slightly slower).

RAID0 does pretty well at doubling the performance of some actions, although it doesn't scale perfectly. But other actions (most random reads for example) don't really benefit from RAID0 at all, and some perform worse than single drives.
post #10 of 12
Thread Starter 
So you are saying that when I went to partition the drives (Control Panel - Admin Tools - Computer Management - Disk Management on Win 7) that I should only see one drive there representing my two HDDs? I definitely have things confused then.

I was getting a prompt on boot up asking me to hit ctrl+r iirc, and I did but it took me to the BIOS screen. Maybe I should try that again tonight. I think I did that between restarts after installing the RAID Controller, maybe that is the problem.

I assume I should delete the drives again before I do this?


edit - is the only difference between setting it up during boot and the way that I have done it that you can put the OS on it? IF so that does not matter much to me.
If not, what exactly did I do by selecting New Mirrored.. and slectign the two drives through the wizard?
Edited by mkohanek - 3/11/11 at 6:50am
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