Xserve RAID - to slow during video capture

I have Xserve RAID with 14 drives in 2 stripes ( 2x7 drives ) in RAID5. I can see in my system two "drives" called RAID1 & RAID2 - each 2.18TB.
When I`m using BlackMagic Disk Speed test utility I have only 150MB/s read and 100MB/s write which is to slow for 1080i HD.
What is wrong ? What should I do to get better performance ?
I`m new in Xserve so maybe somebody could explaine me "step by step" what to do.
I read a little about RAID50 but I have no idea how to create it.
Regards.
Rafal Szermanowicz
www.grupa13.com

Those speeds are fast enough for HD capture.
Anyway, to ensure you're getting full speed, make sure:
1) You have the 1.5 firmware on the RAID
2) Enable controller write cache is checked (enabled)
3) Use drive cache is checked (enabled)
4) Allow host cache flushing is DISABLED (unchecked)
5) Use steady streaming mode is DISABLED (unchecke)
For capture, leaving the settings at 8 stripes as prefetch is probably best. If you are going to be doing extensive playback of uncompressed HD, you may want to consider setting the prefetch at 128 stripes.

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