Slow FCP Writes

I'm trying to optimize my xsan for FinalCut HD. I've got a storage pool made up of 6 Raid5 luns from 3 XServe RAIDS. (1 7 drive lun per controller) Metadata is on an additional RAID box.
Block size is 128 and breadth is 8 for a total of 1MB
Using xsan tuner on a client, I can read 1080i 10 bit FCP files at ~360MBs but i can write at no more than 146MBs. (If I test UNIX file writes, I get about 350MBs)
What have I missed?
What are the optimal settings for writing Uncompressed 1080i 10 bit to an xsan volume?
xsan 1.3
Prefetch 8
Block size 128
Breadth 8
Write caches are enabled
Host flush is disabled
No affinities are used (these seem to have a big performance hit)
Any Ideas?
A
G5 2.5 quad Mac OS X (10.4.7) qlogic switch

Try turning off the Xserve RAID controller write caches except for the one hosting the metadata, but leave the drives' caches turned on (I think).
http://manuals.info.apple.com/en/Xsan1.1TuningGuide.pdf
Page 12
"Although some large write requests might benefit from caching, often they do not. By placing a volume’s metadata storage pool on a controller separate from the data storage pools, you can configure the metadata controller to use caching and the data controller to run without caching. "

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emilfromgothenburg wrote:
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Just to share.
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