What is the ideal RAID 5 logical drive configuration to use with editing 1080p on FCPX?

Question

Hello,
I invested in one of the new Late 2013 Mac Pros (8-core 3GHz, dual Fire Pro D500 w/ 3GM VRAM each, 32GB RAM), along with a Promise Pegasus R6 Thunderbolt (ver 1) RAID because I wanted a fast and supremely smooth editing experience versus slow, laggy, drop frame performance I had been experienceing in my previous Mac (a mid-2010 27" iMac 2.8 GHz Quad-Core, 16GB RAM, Radeon 5750 with 1GB VRAM) that had media stored on a single 3TB firewire drive.
The RAID came pre-configured with 6 x 1TB Toshiba drives giving me a Logical Drive that has 5TB capacity, 128kb stripe size, 512byte sector size, with Read Ahead/Write Back cache policy. I've also enabled "Forced Read Ahead" using terminal.
THE PROBLEM:
Even with this super fast media storage that gives me about 600MB/sec data transfer rate, I'm still sometimes experiencing lag and stuttered playback from the timeline (In all fairness, the stuttering only happens for a few seconds then plays fine, but the lag can be frustrating when I'm trying to click through the timeline to check edits). The footage I work with is 1080p mov files from Canon DSLR that are transcoded to ProRes 422 and Proxy during import into FCPX. I never edit with camera-native formats, always with ProRes. I also always close all other applications, eventhough all the power boasted by the Mac Pro shouldn't have a problem with that. I've tested the video cards by playing multiple 1080p H.264 files at once and it played about 10 simultaneously without a hitch. I've also edited under a new user and still the issue remains. My conclusion is that the lag comes from the RAID. (I did a test project with having my library saved on the internal flash storage and editing improved dramatically with speed and responsiveness, which signals that my problem must lie with the RAID).
THE QUESTION:
Is there a preferred or recommended stripe size and sector size that would cure my problem? Is it because it's RAID 5 even though I'm using 6 disks and getting tremendous sustained data xfer rates?
OTHER RELATED INFO:
My FCPX import settings copies all files into the library and I have Optimized and Proxy checked. My projects are also saved in the same library so everything is contained in one place.
My projects are mostly 40 minute wedding videos 1080p at 23.98fps with lots of short video clips during montage segments, no more than 2 video tracks during the wedding the wedding ceremony.
I frequenly repair permissions on the internal boot drive. Sometimes trash FCPX preferences when performance gets ridiculous or other glitches happen, like audio refusing to play, or the timeline plays no video just audio.
Thank you! Any help or advice is appreciated!

Answer 1

Hi,
Making our tablespace in different directory does not improve the performance. See, Basic thing does if you are lauching your text file from different directory
say Drives C , D and F respectively does your hit any performance (your OS is installed on Drive C). I don't thinnk you will getany boost up performance. See Basicaltl what is happening is that, try to launch you textpad and try to open the files from any there then you file will open immediately, if you ask me the reason behind that, you application is already loaded in the Memory to give the Service (same as ORACLE Instance). That's the difference.
- Pavan Kumar N