RAID speed dropped for some reason..

Hey Guys,

I added a similar post to the DaVinci config forum but thought I could get some more answers here. A while ago when I did a Disk Speed Test, I was getting 260-270 MB/s. After recently realising that my DaVinci performance dropped slightly, I decided to do another Disk Speed Test of which I then found out disk performance dropped to 150-160 MB/s.

I then decided to delete some unnecessary files from my RAID to increase available space, thinking performance could improve as a result. However, I was still getting 150-160MB/s.. :(

I checked my RAID Utility and it still has a green light and says 'Good' on the two volumes I have. The last time the Battery conditioned itself was about two and a half months ago.

What else can I do to get back to 260-270 MB/s again?

Also... and whats strange... I did another test on my Mac HD volume at RAID5 and was getting almost 300mbs as opposed to my other volume (currently 150mbs. 260mbs before....). Im really confused...

I have x4 WD black caviar HDs (1TB each) and Apple RAID card.


Any help is appreciated (I'm still learning tech basics).
Thanks

Alex.

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8-core, OSX 10.7.3, 16GB
RAID5 4TB,
Radeon HD 5770, Quadro 4000
DeckLink HD Extreme 3D
JVC DT-V24G1
Resolve 8.2.1 + Wave