> Have you considered softraid crypto?
quoted text
> 


Thanks for this independent advice. Looks like it works at the block
device level which must be better.

I must say that while the official openbsd documentation I've seen is
second to none, there seems to be relatively little information out
there on data encryption (compared to the biblical tombs on the subject
in the linux world). I tend to look through practiacal examples and
tutorials when I try something new, and the one I found for this was
three years old.

What I'm trying to acheive is to stripe a few of these 300GB disks
together and encrypt the resulting large volume.

I shall persevere - thanks again for your replies.