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Running RAID 1 and RAID 0 on a system.

post #1 of 12
Thread Starter 
What's up guys, did some searching for this on my phone but the results didn't help at all (phone search seems to be worse via Tapatalk).

I'm building a new system and I ordered four Samsung 1TB Spinpoints. I planned to run two harddrives in RAID 1 (boot drive) and two harddrives in RAID 0 (uncompressed 1080p video capture).

I remember reading somewhere that RAID 1 and RAID 0 were not possible to be run in conjunction with one another, is this true?

If so do I have any alternatives?

The computer I'm building is in my signature, I would really appreciate any input on the matter.

Thank you!
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post #2 of 12
You should be able to set that up even with the onboard intel controller... pretty easily. No issues. Be sure to consider stripe size carefully though if you are intending to use one for giant video files.
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post #3 of 12
Yes, you may have two separate arrays. You may also mix and match different types of arrays. You can even use two separate types of arrays on the same disks. (2x1TB, 600GB RAID-0 + 700GB RAID-1 for example)
     
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post #4 of 12
Onboard RAID may sound complicated to setup...but as long as you know how to get to its configuration menu you should be set. I don't see why you shouldn't be able to setup two hard drives in RAID-1 and another two drives in RAID-0. All you do is choose the two drives you want to setup in a specific RAID while doing it again with the other two.

Only thing that may get confusing is the RAID-0 stripe size which depends on your usage. If you do more sequential writes then 64k/128k might be the option to choose...otherwise pick the smaller sizes.
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post #5 of 12
Thread Starter 
Alright I was just curious, I don't think I'll have any trouble setting up RAID. My friend setup my current RAID 0 setup so I have no idea how he configured it.

The RAID 0 drives will only be used for footage storage, I'll be recording uncompressed 1080p video on the Xbox 360 for video editing. The file sizes range from 10-15 GB per ten minute video. Not sure which type of strip size should be used for this type of application.

I never really understood the whole thing between sequential writes vs random writes and am very keen to understand it all. When I do my google searches it seems to be a different chapter to an entire book (if you get what I mean lol). I seem to be reading each chapter out of order and it doesn't make any sense to me.

Anyone mind giving me a run down on things? Sorry if this is a common question I'd just really like to get a grasp on all of this.

Thanks again.
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post #6 of 12
ive been running a raid 5 and a raid 0 on several dif systems for a few years now. i know its not a raid 1 and a raid 0 but its basically the same principle
    
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post #7 of 12
Sequential writes are writes that end up on the drive right after each other. The head can just stay on whatever track it's on, and keep dropping down data.

Random writes are writes that require the head to seek to another location. This doesn't apply to you, since your OS isn't on the same drive - but if you were recording video, every read/write from another program or from Windows would be a random read/write. It'd knock the head out of position, so then the head would have to do another seek to get back to its original location before it could start writing a strip of video data again.

While most drives can manage 120MB/sec+ for sequential reads/writes, few can manage more than 60MB/sec for random reads/writes. But as the reads/writes get larger, the speed the drive can maintain goes up.

It's helpful to think of reads/writes as just a "seek" and then the "read/write". Sequential reading/writing is one seek followed by reading or writing hundreds of megabytes of data. Opening a web browser is hundreds of tiny seeks followed by hundreds of tiny reads - all of which may be under 64KB in size. And opening a game may be hundreds of seeks, but all involving reading megabytes of data.


One thing people often overlook is how much time a drive actually spends doing different aspects of reads/writes. Take a look at HDTune - modern drives can easily manage 90MB/sec.



One second is 1000ms, so divide by 1000 and you have... 90KB per ms.

So a read off this Green drive consists of seeking to a file (15-25ms on average) then reading however much data. (@ 90KB per ms) A 64KB read/write really isn't taking advantage of all that the drive can offer. The longer the head can stay in one place the more efficiently the drive performs.
     
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post #8 of 12
I was going to ask a similar question, so I'll ask here, but i seem to understand that the answer is yes
I want to use the 4 intel sata2 ports to setup 2 RAID1 arrays of 2 disks each: is it possible?
OS will boot from a sata3 port from a single ssd.
mobo is P67 based.
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by Kramy View Post
Sequential writes are writes that end up on the drive right after each other. The head can just stay on whatever track it's on, and keep dropping down data.

Random writes are writes that require the head to seek to another location. This doesn't apply to you, since your OS isn't on the same drive - but if you were recording video, every read/write from another program or from Windows would be a random read/write. It'd knock the head out of position, so then the head would have to do another seek to get back to its original location before it could start writing a strip of video data again.

While most drives can manage 120MB/sec+ for sequential reads/writes, few can manage more than 60MB/sec for random reads/writes. But as the reads/writes get larger, the speed the drive can maintain goes up.

It's helpful to think of reads/writes as just a "seek" and then the "read/write". Sequential reading/writing is one seek followed by reading or writing hundreds of megabytes of data. Opening a web browser is hundreds of tiny seeks followed by hundreds of tiny reads - all of which may be under 64KB in size. And opening a game may be hundreds of seeks, but all involving reading megabytes of data.


One thing people often overlook is how much time a drive actually spends doing different aspects of reads/writes. Take a look at HDTune - modern drives can easily manage 90MB/sec.



One second is 1000ms, so divide by 1000 and you have... 90KB per ms.

So a read off this Green drive consists of seeking to a file (15-25ms on average) then reading however much data. (@ 90KB per ms) A 64KB read/write really isn't taking advantage of all that the drive can offer. The longer the head can stay in one place the more efficiently the drive performs.
Beautiful explanation, thank you so much. I'll be sure to drop you rep when I get home from work! Thanks again.
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Crimson Obsidian
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post #10 of 12
I however CANNOT set up raid 1 and raid 0 on my mobo, system refuses to boot into windows and if it does, the non boot drives dont show up at all. did you get yours working?
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