Raid performance. What do you get?

Hi All,
I'm setting up an XSan using 4 14*500Gigs XRaids + 1 XRaid for the metadata. Before installing XSan I'm testing the speed of the system when it's striped as a raid 0. We're using atto dual 4Gigabyte cards in the computers, together with a QLogic switch. Using 4 Raid5 slices, and striping them togethere as raid 0, I get speeds of about 250 Mbyte/s read, 300 Mbyte/s write using Decklinks speeddisk utility. What speeds do you get?
I've also posted this in the XSan forum, I guess it belongs in both.

Hi Wout,
I have a 180x14 xserve raid with 512mb of cache. I have a PCI-X card and I seem to max out at 185mb/s write and around 235mb's read. This is on a Dual 2ghz G5. BTW performance seems pretty flat going from PCI to PCI-X and upgrading the caches from 128mb. Seems like the speed of the disks and controllers is the determining factor.
I'm experimenting with a 2nd xserve raid and I'll report the performance soon.
Cheers,
Sam

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