Strange performance from RAID5 using WD RE4 disks

Posted by Howard on Super User See other posts from Super User or by Howard
Published on 2011-09-06T13:17:29Z Indexed on 2012/10/29 23:05 UTC
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hard-drive

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Performance

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raid

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amd

I've noticed a bit of a performance issue with some WD RE4 drives I'm using under AMD's hardware RAID solution. First a bit of background:

Environment: Windows 7 home premium x64
HDD's: 3x 1TB WD Raid Edition 4 in a RAID 5 setup with 128 kbyte stripe (2TB usable space)
Testing Tool: HD Tune, process set to "High Priority"
Processor: AMD Phenom II x6 1100T
Ram: 16GB DDR3/1600mhz
Motherboard: MSI 970A-G45

The image below pretty much depicts the issue I'm having. Every test has the same thing, a period of similar length where the performance drops to a few megabytes a second. This can't be a TLER issue as the purpose of RE4's is to work around that.

Any help would be greatly appreciated.

enter image description here

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