[linux-lvm] About Extending LVM size with Hardware Raid

[Piete Brooks]

> I don't think there's a reliable, safe way to hotswap PATA,

I thought it was safe (i.e. would not damage the IDE bus drivers in the 
computer or disc) so long as the caddy takes care with the order in which the 
pins are (dis)connected [e.g. by having different pin lengths] or less subtly, 
by having the caddy lock disconnect the power on unlocking.

[ of course, you only have one device per IDE bus ]

> and even if the hardware exists Linux doesn't support it well.

Best bet is to look at the various "select bay" commands for laptops.