[Staffslug] Dell 1850 increasing raid disks

Hi all, Been lurking on here for a while, and of course when I delurk it's for a question rather than an answer :) Got a Dell 1855 here at home with a couple of hardware raid disks running debian. I have a couple of bigger disks I want to put in it to give me more space. The hardware raid doesn't give me the option to mirror onto the bigger disks one at a time unless I keep the same volume size, which seems fairly sane. Anyone know a way to do it without having to image the server to somewhere else, replace disks (and rebuild raid volume bigger) then image back? Or failing that, can anyone recommend some imaging software I can use. I'm fairly up on the linux side of things as far as resizing partitions is concerned, and I have a PXE boot environment here if that helps. I don't currently have a USB caddy with enough space on it to make this easy, so I'm after ideas. Cheers for any help :) Adam (redbaron on #staffslug)