Jerky video when uncompressed

Ok... I'm going to be a bit long winded here so everyone knows the situation exactly.
I use a FCP box at work editting local news promos. I work in DV.... haven't had any problems...
My boss was nice enough to buy me a new system so I can work uncompressed and such. Here is the run down of what I have....
4x2.5 GHz PowerPC G5
MacOSX 10.4.6
4.5 GB DDR2 SDRAM
Final Cut Pro version 5.0.4
AJA Kona LH
Sequence Preset: AJA Kona LH: 525 29.97 10bit
Capture Preset: AJA Kona LH: 525 29.97 10bit
Device Control Preset: AJA Kona LH NTSC Sony VTR
Video Playback: AJA Kona 525i29.97 10bit (720x486)
Audio Playback: AJA Kona
Deck: Sony DNW-A75 Betacam SX
Storage: Apple XServe Raid with 1Terabyte over 4 drives.
Video comes from the deck to the AJA Kona through an SDI line.
I do not know much of how the Raid is setup since some dude came and did it for us.... it doesnt work like I had intended it to.
We have the FCP running DV quality, an After Effects box, and the Uncompressed quad FCP all three hooked up to it.
My idea had been that this way all three could access the same information. However, when the guy set it up for us... he said he partitioned it four ways. Each computer gets one partition with the uncompressed FCP box getting a second. From any of those boxes I cannot access the other box's partitions... clearly this defeats the purpose of the system....
Anyway, I have found that when I digitize video on my new uncompressed system.... after about 15 seconds it starts to get jerky. The video will freeze while the audio continues to play. Usually it will do this for maybe 15 frames and then play again for maybe 8 then do it again a couple of times. It also reports timecode breaks repeatedly when I know for a fact there are no breaks on the tape.
To trouble shoot this I changed my capture setting to 8 bit uncompressed. The problem persisted. However, when I changed it over to DV compression, the problem went away and there were no timecode breaks.
If anyone has suggestions I would greatly appreciate them and I might bake you brownies. haha!
If you want my 100% speculative guess... I think that perhaps when dude partitioned the Raid, he gave each computer a single drive on the array. This way the information being written is no longer being split four ways for faster read and write times but is simply being written by one drive, the drive can't keep up with the uncompressed video and thus I get lag. However, seeing as I didn't set that up, I don't know if that is the case or if that is even possible. I don't have much experience at the hardware end of things!
Help me!!
Kip Gordon
Memphis, TN
Producer

Okay Patrick, here's the latest in my jerky video saga...
I ran the test with these settings:
Test: Disk Read/Write
Disk: Host1Media1 (XServe Partition)
File Size: 4.0 GB
Frame Size: 720x486 10-bit
File System Cache: Disabled
Simultaneous KNOA DMA: On (I'm not sure what this is but I clicked it)
The average write speed was about 100MB/second
The average read speed was about 110MB/second
I noticed though that at frame 385 it was writing 192.2MB/s and then for frame 386 it dropped to 0.4MB/s, frame 387 was 1.8MB/s and then 388 was back to 120.0MB/s. This occured again around frame 3400.
I asked the IT guy here at work and he said that sort of behavior is normal for a drive system and shouldn't cause this problem.
I also tried some more experiments today. I tried setting my capture scratch to the internal media drive and had no problems digitizing 10bit uncompressed. The problem seems to only be with the XServe. We called the guy who installed it for us and he said to reboot it and if that didnt work to reformat the drives. Basically, I have no faith in the guy. When he installed the thing he didn't seem to have a clue what he was doing. Go figure.
Anyway, based on what I've seen I've come to the conclusion that the problem is not with the KONA card (it plays the video fine, its just when we digitize), FCP, or the computer but is instead with the XServe.
I don't have much experience with this stuff but, it all seems to point in that direction to me.
I'm not an idiot am I? The XServe is meant to be used for this sort of thing, right? I hope we didn't just buy the wrong thing alltogether as well, that would suck just a bit! :/
Once again, any more suggestions would rock as I'm at a loss as to what would cause this. Perhaps I should post in the XServe forum?
Kip
btw, I've tried to supply as much info as possible whenever possible, seeing as I've read so often comments such as "what version are you using? What deck? ****, what computer?!" If anything pertinent is missing please let me know!

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