I've got a machine with two physical identical hard drives which are currently set up with LVM as one logical volume. The original idea was to make use of as much "contiguous" space as possible in order to store a big amount of very large data. Time passed, and the current use of the machine changed, so now I'd rather have the two disks in RAID1, both for some extra safety (yes, I do make backups anyway) and 'cause I really don't need that much space anymore. The main concern is whether the second disk does actually have data on it, but I couldn't find any way to actually know how much data is stored on the physical volume.
I'm trying to figure out what the best way to do this would be, and what features does LVM offer me for this. Would I have to reinstall from scratch, or is there any way I could "split" the LVM and create a RAID1 array while keeping the data on - at least - the first disk (supposing the second one has no data on it)?
Thank you very much.