Gee thanks! I'm relieved not to be alone on that one...
Welcome in my mess, is that what I should say?
- the disks partitioning: I know, when I came to understand enough, that ugly scheme had my eyes wtering, but I know there's not much I can do about it. Though I didn't know about the free-first-1M (thanks!), I think sda1 is just for that and serves no other purpose, or maybe to host some rescue tool or I don't know, can't be mounted or anything so I just leave it alone and try to forget about it. I just want to add that this is all a result of automatic partitioning by the help of the lvm manager, none of this I did myself (as I didn't know what to do at the time).
I actually used the liveCD to reorganise my two new disks like you suggested.
I removed them from the lvm,
made a first partition from 1M to 4G on each (first 1M free)
in case the lone disk needs to be bootable,
(parted)mkpart primary ext4 1M 4G
used up the rest of the space to create a data partition that I could add to the volume group
then made ext4 partitions in it
mkpart primary ext4 4G -1s
then integrated those in the main volume group
Last I created a new logical volume for later use
vgextend binomiale /dev/sdb2
vgextend binomiale /dev/sdd2
Only issue is I can't seem to mount those, using the path /dev/mapper/binomiale/dat or /dev/binomiale/dat, it keeps asking me for a filesystem type, but I can feed it pretty much anything, I won't get closer to mounting it.
lvcreate -C y -L 1500M -n dat binomiale
I'm writing all that for the record, mainly. If you happen to have an idea about that too, I'll say don't hesitate
- I think I already overinstalled the grub to sdc but to no avail, with the boot partition properly mounted and all, anyway I did it once more, following your specific instructions. I'm still stuck at the same point, no change here: blinking cusror about 4 lines down, just before grub display time, I'd say. And my BIOS seems to detect only one bootable drive as when I wander over the BIOS options, the boot order I can specify only includes one disk, just not sure which one of sda or sdc.
Maybe it's sda that's detected by the BIOS as bootable, but not sdc ?