I am moving my Ubuntu install to lvm over raid 1. I created the arrays with only 1 disk initially, planning to add the second disk later. I got the files moved and the system booted up succesfully on the new disk, but the arrays and paritions seemed to have changed names. Initially I partitioned the disk as follows:
Device Boot Start End Blocks Id System
/dev/sda1 * 1 20 153600 fd Linux raid autodetect
/dev/sda2 20 243202 1953359960 fd Linux raid autodetect
I then created 2 degraded raid arrays, corresponding to these partitions, md0 for /boot and md1 for lvm with everything else on it. After installing grub and booting from the new disk, everything seems to work except that weird things are afoot. /dev/md1 has partions on it even though I all I did was pvcreate /dev/md1:
Device Boot Start End Blocks Id System
/dev/md1p1 * 257 38656 153600 fd Linux raid autodetect
/dev/md1p2 38657 488378646 1953359960 fd Linux raid autodetect
Additionally, /proc/mdstat shows (I have already added the second disk):
md0 : active raid1 sdc1[1] md1p1[0]
153536 blocks [2/2] [UU]
md1 : active raid1 sdc2[2] sda[0]
1953359872 blocks [2/1] [U_]
Where did md1p1 come from, and why doesn't /proc/mdstat show sda1 and sdc1, and sda2 and sdc2?
