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post #11 of 16
Quote:
Originally Posted by F1ynn View Post

Well i wanna Raid two together for a performance boost, i might do this after i get my SSD so that i dont have to reformat again so i wanna do something like this
SSD=boot + a few big programs >>>2xHDD for 1TB RAID general programs & files
then i have another 1 TB for backup

nice idea, especially the back up (bolded).. so RAID 1 or 0 for the two drives for general programs and files? RAID 0 will give you more of a boost in performance but RAID 1 will give you a layer of redundancy before the back up.. either way as long as you back up your most important data either way has its +/-
RAID 0 of two x 1TB will give you about 1.9TB of usable space and a theoretical 2 x boost in performance but you never get that much..
RAID 1 of two x 1TB will give you about 0.9TB of usable space and a theoretical 2x read speed, no write speed gain again you dont get that gains as advertised..

just some info so you can decide what RAID you would like smile.gif
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post #12 of 16
Thread Starter 
so would a RAID0 give me the best performance when loading a gamer/program?
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post #13 of 16
Quote:
Originally Posted by F1ynn View Post

so would a RAID0 give me the best performance when loading a gamer/program?

yes
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post #14 of 16
in read operations they will theoretically be similar.. RAID 0 has better performance in write operations smile.gif
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post #15 of 16
There's just one problem - your two drives are very different in performance.

In general with RAID-0 on desktop motherboards, you can say that... you get less performance than double the slowest drive's sequential speeds, and access times go up to match the slowest drive's access times.

That means if you RAID-0 the drives you will get at max 135-140MB/sec sequential (~55% increase), and around 20ms access times. (25% increase) For large file copies and stuff the sequential speed is all that really matters, but for games or as an OS drive that is not the case. A lot of time is spent seeking rather than reading/writing, so faster access times really matter. Since the increased access times count against improved performance, you can expect at max a ~23% performance increase - but in reality it would probably be lower than those theoretical numbers. After all, with matched drives the theoretical numbers would be a ~95% performance increase, and you don't get that. tongue.gif

I believe in your case RAID-0 might actually count against you. In games where you have about 16ms before the next frame is drawn on the screen, a few milliseconds extra could be enough that a frame gets dropped and you experience a stutter. That goes directly against your goal. Furthermore, when you put two drives in RAID-0 they must share a single drive's IOPS (IO's per second - a rough measurement of how many files a drive can read in one second), because both drives have to work together for every read and write.

hdtuneproahcirandomacce.png

Hmm... 36 1MB reads per second. I better not need more than a few 1MB textures/models at once, or I'll have a stutter on my hands. (Barring engines that guard against that - UE3 for example streams all textures in, so you get blurry soup textures rather than stutters.)

Something worth considering - sometimes you can gain more speed by splitting heavy programs or games off to a dedicated lone drive, preventing other things from interfering and consuming those crucial IOPS. For example, encoding video from a single HDD to another single HDD would likely be faster than encoding from a RAID-0 array to that same array. This is especially true in your case, where one drive is slower than the other.

For myself I split my OS off to a dedicated drive, moved my web browsers to a second drive (because I have them open all the time), and use a third drive for Steam games. That prevents any of the stuff that I use simultaneously from dragging down the performance of anything else.


Heh. I have about 500GB of Steam games installed at the moment. For interest I re-ran the Access Time benchmark, testing only the first 500GB of my Steam games drive:

hdtuneproahcirandomacce.png

Not bad, actually. That's about 1 texture/model per frame. Some of the time it may even be faster than that, as long as the data is located near whatever the drive last read. smile.gif
Edited by Kramy - 4/18/12 at 12:41am
     
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post #16 of 16
Thread Starter 
The 1Tb i was planning on using for backing up i can test here in a min to see if its similar. but hopefully this will work out.
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