> mpi/mpii cards that do IR/IS or IM should do RAID 1 just fine and are
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> supported by bioctl.B  You just have to purchase the card carefully
> and make sure it has one of those acronyms.
Thanks for the info. This will make it easier to find the right cards
I don't want to appear lazy but finding the actual products is quite
hard because most shops/vendors do not supply chipset iformation.
So any furher information about actual models would be appreciated.

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> A bit more expensive would be mfi but those are well supported.
Noted.
B 
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> What I don't know much about but is cheap are the areca cards.B  Some
> people swear by them; I simply haven't used them so I have no opinion.
The areca cards look very good and are quite inexpensive when compared to
other similar cards but they are way more expensive than e.g. mpi cards
and a battery backup module for the builtin cache would also be needed.
They would be my first choice for Raid cards that can do more than Raid1.