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WD2002FYPS HD tune interpretation

post #1 of 3
Thread Starter 
Hi,
I had 4 x WD2002FYPS ( 2TB drive ) in a RAID10 setup connected to DELL Perc H700 controller. As I have not managed to put production data on the drives earlier than 3 months after installation, I have used it as standard storage for movies ( such a luxury ). In Raid 10, the clean capacity was 3.63Tb and around 2TB movies were stored on it.
Issue description:
After movie playback start, heavy stuttering occured and the movie either continued and the stuttering has repeated or, it stopped playing. Pls note bitrate of the movies is more than 20MB/s.
So I decided to copy one of the problematic movie files to internal drive/external drive. Normal transfer speed would be 70-110MB/s, but copying here was way too slow:
http://img858.imageshack.us/f/raid10tootherdrives.png/

Em I wrong to say, that if the bitrate of the movie is 25MB/s and the drive has problems to stream faster than 20MB/s, the video stutters?

If you have Raid 10 with 4 drives, you don´t see the drives individually and you can not identify exactly the drive which has problems. Happily, no production data were there yet, so I reconfigured the Raid 10 as 4 x Raid0 with full Virtual disk initialization. Then I was able to use HD tune in Win7 to test the read transfer speeds on every drive individually (4drives appeared in win ). Here they are:

http://img251.imageshack.us/f/read10gb1.png/
http://img69.imageshack.us/f/disk1ot...testsfull.png/
http://img34.imageshack.us/f/disk1ot...testsheal.png/

I did more than 1 test and as you can notice, the disk 1 has repeatedly problem at around 6.3Gb when doing read Read benchmark ( short stroke 10Gb ). This issue occurs also at the same point when doing 20Gb or 40Gb short stroke tests. Other drive do not behave this way, they keep the read performance on the same level.
I did a full error scan overnight on the problematic disk1 - without any reported wrong sectors. As the drives are connected to the H700 controller, health check is not available for any of the drives.

What is causing this heavy glitch in reading?

Can this be the reason for the low read/transfer speeds and playback stuttering?

Thanks
Pluto
Edited by Plutotype - 4/17/11 at 2:27am
post #2 of 3
Try reducing some of the space that's taken up. Or try a powerful hard drive defragmentation tool. Ensure you have nothing running in the background within the memory causing an abornal CPU usage whillst unknown stuff is being executed in the RAM.

Edit: Yes the glitch in reading is causing stuttering.
X79-GCN
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X79-GCN
(22 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
MouseAudio
Logitech G400s Senn HD 598 
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post #3 of 3
Thread Starter 
Hi, thanks
The hard drives were tested empty and every drive was fully initialized through Perc H700 BIOS. This process took around 8hours for the 4 drives. Then, every drive has been quick formatted to 64k cluster size. So I had 4 empty drives and did these tests.
Do you know what is weird? The results with the glitch can happen 4times, but next time the glitch is not there. The degraded copying transfer speeds also occur randomly.


And the weirdest thing is following. I did exactly the same short stroke 10GB test on one of my Samsung HD204UI connected to the motherboard intel sata controller. All 3 Samsung drives gave me 25 percent better results:
http://img215.imageshack.us/i/intern...gsametest.png/

Can the issue be in the Perc H700 controller? WD RE4 GP are enterprise hard drives, connected to such powerful raid controller and should perform better, not worse than the Samsungs.

Thanks and Regards
Pluto
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