What pelham asked, seems to me absolutely reasonable,
but unfortunately he didnt become an answer.
I am in the same situation and try to expand my volume.
I can use the open-E DSS web interface and then "configuration" -> "volume manager".
A New hard drive appears (unused), which I have build in my controller software before
(Adaptec Storage Manger)
I can expand my volume group then (what is exactly what I want).
After that there comes the prompt, pelham describes (formatting with data loss).
Do I loose data on the old harddisk (which would cost my job)
or just on the new one (which doesnt matter at all, cause there is no data at all?

Thanks in Advance
Juergen