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4x 840 Pro 128GB in RAID-0 - Asus Z87 MB

post #1 of 42
Thread Starter 
Ok..I know this uncharted territory at this point, but I wanted to share my results/issues so far.

I have a Asus Z87-A MB with 4770k and 4 Samsung 840 Pro 128Gb SSD in a RAID-0. I am using the latest intel Drivers 12.6..

I think I am totally saturating the Intel RAID controller?? I thought I might see better performance...?

Any suggestions?

     
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post #2 of 42
Wow that's good. I mean with a 6gbps controller the highest possible sequential read you could get is 1536MB/s so I'm not sure what improvement you want to see. You're very close to that with 1493.

Edit: here's my two 830s on z77 for reference.


Edited by estabya - 6/2/13 at 5:59pm
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post #3 of 42
Thread Starter 
Ok...Need some education here....Why is 1536 the maximum on a 6gbps controller?

I figured that one drive gets about 500mbs in sequential reads.....so 4 would get close to 2000??

Any idea why the 4k read is so low? Sorry if these are newb questions...just trying to learn.

Thanks,

-M
Edited by managerman - 6/2/13 at 6:07pm
     
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post #4 of 42
Thread Starter 
Here is the ATTO run...

     
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post #5 of 42
I've never used ATTO so idk about that.

For the 1536 maximum: 6gbps is 6 gigabits per second. There are 1024 megabits in a gigabit so 6gbps is 6144Mbps. 8 bits in a byte so 6144Mbps is equal to 768MBps. 768 megabytes times 2 ports in raid zero is a theoretical max of 1536MBps.

For 4K I don't think that's terrible, but try disabling power saving options in the bios, make sure you've got the newest firmware on the drives, and make sure you don't have the drive set to automatically compress files in windows.
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post #6 of 42
Thread Starter 
estabya,

Thanks for the information! your explanation makes perfect sense if I had 2 drives, but I have 4 drives...The new Z87 boards have 6 Sata 3.0 6GBps ports...

Where would I check to see if the drive is compressing files? I have windows 8 64

Thanks,

-M
     
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post #7 of 42
Quote:
Originally Posted by managerman View Post

estabya,

Thanks for the information! your explanation makes perfect sense if I had 2 drives, but I have 4 drives...The new Z87 boards have 6 Sata 3.0 6GBps ports...

Where would I check to see if the drive is compressing files? I have windows 8 64

Thanks,

-M

Haha my bad I did not even notice that you said 4 drives for some reason tongue.gif Lemme do a bit more research to find what the issue could be...

As far as compressing the drive, just right click the drive in Explorer and hit properties. There's a box that says "compress this drive to save disk space." Just make sure it isn't checked smile.gif
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post #8 of 42
Hey guys, I JUST ordered a 840 Pro too tongue.gif

Im trying to decide whether to raid 0 two 128Gb drives or just stick with one. It'll be my only drive, so I don't know if I'll go over it or not (I keep my PC pretty clean). What do you guys think?

(not trying to hijack I swear, I just saw we had this in common!)
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post #9 of 42
while your sequential read/ write are very good, read this
http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485.html
Quote:
The RAID-based configurations undoubtedly scored the first touchdown given exceptional sequential results, but the game didn't end there. Individual SSDs regained ground in the tests that followed, even posting better scores in some of them. Random I/O performance is a good example. Striped drives are certainly better equipped to push more IOPS, but only when you're stacking commands more than four high. Jumping up to a queue depth of 32, 16, or even eight is really uncommon in a desktop or workstation environment. As a result, the performance differences are far less pronounced in the real world.

One SSD on its own scores again in the contrived tests we put together. The performance differences when we boot up and shut down Windows 8, then fire up different applications, are marginal at best and not noticeable in practice. Single drives actually manage to outperform the striped arrays some of the time, even.

If you're planning an upgrade and want to know whether to buy a couple of 128 GB drives and put them in RAID 0 or just grab a single 256 GB SSD, for example, the answer still seems clear enough to us: just grab the large drive and use one. Using Samsung's 840 Pros as an example, a pair of 128 GB drives will run you $300 on Newegg right now. The 256 GB model sells for $240 (maybe that's why it's out of stock currently). There's also the issue of reliability. If one drive in a RAID 0 configuration fails, the entire array is lost. At least for a primary system drive, one SSD on its own is safer.

I'd suggest splitting your 4 x RAID0 down to 2 separate RAID0's. It'd cut your risk in half and you wouldnt have any real performance differences. (maybe even better without all the overhead)
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Hmm I'm having a hard time finding anything that has 4 SSDs in RAID 0, let alone 4 840 Pros. However, based on the speeds of the 2 way RAID 0 results I am seeing I would guess that your sequential read/write speeds may be a result of hitting the maximum bandwidth of the controller. I may be way off, or maybe a BIOS update will address this in the future. Like you said it's uncharted territory so you may have to wait until the community has a bit more knowledge on this particular chipset, and wait till the other people running 4 way RAID 0 on Z87 start to pop up.
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Originally Posted by TehOnlyMITTENS View Post

Hey guys, I JUST ordered a 840 Pro too tongue.gif

Im trying to decide whether to raid 0 two 128Gb drives or just stick with one. It'll be my only drive, so I don't know if I'll go over it or not (I keep my PC pretty clean). What do you guys think?

(not trying to hijack I swear, I just saw we had this in common!)

Depends on what chipset you have. If you have Z77 or Z87 go for RAID, but because these are the only two chipsets that support TRIM in RAID 0, I'd recommend a single drive for any other chipset thumb.gif

Not like you'll be disappointed by a single 840 Pro anyway. I honestly didn't even notice a tangible speed difference when going from a single 830 to RAID 0.
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Pieced Together
(12 items)
 
Macbook Pro 13"
(6 items)
 
 
CPUMotherboardGraphicsRAM
i3 2120 EVGA Z77 FTW EVGA GTX 760 SC ACX PNY 2x4Gb 1866 CL10 
Hard DriveCoolingOSMonitor
OWC Mercury Electra 240Gb CM Hyper TX3 Windows 10 LG 34UM95 
KeyboardPowerCaseMouse
Apple Keyboard Seasonic 430W Rosewill Challenger Logitech G302 
CPUGraphicsRAMHard Drive
i5 4278U Iris 5100 8Gb DDR3 256Gb PCIe SSD 
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El Capitan Windows 10 
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Overclock.net › Forums › Components › Hard Drives & Storage › SSD › 4x 840 Pro 128GB in RAID-0 - Asus Z87 MB