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The Highpoint 2320 doesn't have real RAID on it - it's just a software raid controller with driver-based RAID - but it's still $250. For that price you might as well buy an LSI SAS controller. I don't know of anything else that's cheaper.
Have you considered a port multiplier?
Does such a beast exist? I'm looking for one with 8 sata ports but no raid functionality. Just a controller like the Supermicro SAT2-MV8.
And works under Linux.
Those are iffy if they work under linux.
Maybe a year or 6 months ago, however the winds have shifted (Suse 10.3). May wish to ask mikesm a few questions or to post in here.
off hand do you know if these work in gentoo and ubuntu. i'm still googling but thought i would post to see.
http://www.addonics.com/products/host_controller/ad5sapm.asp
This is one of the few internal cards that I have found. It seems like the majority of the port multipliers are geared towards eSATA enclosures.
These are what I use. The 3726 based PMP's work well in my experience.
They appear to be a bit more expensive then the Promise 4-port SATA controller cards I was looking at. I think these will be worth the extra cost since they will work well with the 5-drive SATA back planes, without the bottleneck of the PCI controller cards.