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Lousy Samsung F4 Raid-5 performance - Page 2

post #11 of 22
Yea give it another go in 24 hours from the initial setup and if it is still slow then go from there.
post #12 of 22
Thread Starter 
Quote:
Originally Posted by thrasherht View Post
Yea give it another go in 24 hours from the initial setup and if it is still slow then go from there.
Ok, I'll try that.

Thanks!
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post #13 of 22
Quote:
Originally Posted by thrasherht View Post
Yea give it another go in 24 hours from the initial setup and if it is still slow then go from there.
My 5x1.5tb raid5 array only takes about 5-6 hours to rebuild, so maybe 24hours is a bit much.

But than again it will ultimately be decided with your raid controller. As mine (nvidia raid controller for my raid 5 array) tells me when its degraded and/or rebuilding. Same goes with my Highpoint raid controller for my 2x750gb drives.
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post #14 of 22
i have the same drives in raid 5 let me run a hd tune and see what i get
    
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post #15 of 22
raid 5 spinpoint f3's 320gb x3


and just to show off a bit
usb 3.0 spinpoint f3 1tb


raid 0 intel x25v ssd's x2
    
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post #16 of 22
@OP

RAID 5 read performance can usually be expressed as (n - 1) * s where n is the number of drives and s is the sequential data rate of each drive.

Basically, calculate the theoretical performance of the drives in RAID 0, then remove the performance of one drive - that's your RAID 5 read performance.

Each of your drives is capable of ~140MB/sec, hence your array should be pulling around 280MB/sec. Give it a few hours to sync up, the run the benchmark again.. Your RAID controller software should be telling you what your controller is doing.
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post #17 of 22
Thread Starter 
Well I did a second test today after having Intel Matrix Storage Management "Initialize" the array somehow and the results are here:


Nowhere near what ghettogeddy is getting (although it seems he has F3-s instead of F4-s, but I thought that F4-s were even faster).
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post #18 of 22
Quote:
Originally Posted by Mike-O View Post
Well I did a second test today after having Intel Matrix Storage Management "Initialize" the array somehow and the results ).
The new version is Rapid Storage Technology
http://downloadcenter.intel.com/Deta...+RST)&lang=eng

You also have to wait for it to be Initialized not as it Initializing in RST you will see this listed as yes for Initialized in advanced.

Also Enable Write-back cache And with HD tune go to setting > Benchmark and change Block size to 8MB.
Edited by PeterUK - 1/27/11 at 9:18am
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post #19 of 22
Thread Starter 
Ok, I'll try the new one. I downloaded drivers from the Asus website just to be sure, but I guess it's better to find them yourself after all.

It finished initializing and is showing that the array is a-ok, so that shouldn't be a problem.. I hope
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post #20 of 22
Thread Starter 
Well I installed the new Intel software and it shows the arrays status as Initialized. Changed the block size in HDTune to 8mb.

I also enabled the write back cache and here are the results:


(I first did a test with the default block size, and the peaks were quite big in that mode. Minimum transfer rate dropped to 5mb. Forgot to take a screen though, but the picture is similar to what i had before, only the scale moved up like in the 8mb test.)

I don't know what to think of it anymore. Is it okay to leave the cache enabled? Was that the cause of the slow performance?
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