I’m trying to access data on a hard drive using a rescue system. I’ve mounted the root partition as so: mount /dev/md1 /mnt If I do cat /mnt/etc/fstab I see /dev/vg00/var /var xfs So I tried: mount /dev/vg00/usr /mnt/usr/ But I get the error message: mount: special device /dev/vg00/usr does not exist Why does it say that the device doesn’t exist if it exists? Asked by Jorge Bellido Try this: pvscan vgscan vgchange -a y [...]

I have a dual SATA drive setup for a file storage/general purpose box, which is arranged thus: /dev/sda1 + /dev/sda1 = /dev/md0 RAID1 –> /boot /dev/sda2 + /dev/sdb2 = /dev/md1 RAID1 –> LVM with VGs and LVs for /, /usr, /var, etc. partitions. I chose this setup during Ubuntu install and it worked quite fine, until some latest updates that apparently included kernel update or something like that, which required GRUB to modify something. After [...]