Before shutting down your system, copy the output of your current fstab in order to mount your partitions:
You 've got to mount somewhere the original filesystem in order to copy it, preferably as read-only:
Assuming our old disk is /dev/sda with 3 partitions (all of them LVM):
I used 2 partitions, sdb1 for the the whole filesystem and of course a small swap sdb2 partition
Format the partitions:
Fix grub:
You could use disk UUID instead of /dev/sdax:
# cat /etc/fstabBoot from a live cd (I used an ubuntu 14.04)
You 've got to mount somewhere the original filesystem in order to copy it, preferably as read-only:
Assuming our old disk is /dev/sda with 3 partitions (all of them LVM):
# mkdir /mnt/olddisk /mnt/olddisk/oldboot /mnt/olddisk/oldroot /mnt/olddisk/oldvar # mount -o ro /dev/mapper/vg1-lv_XXX /mnt/olddisk/oldboot # mount -o ro /dev/mapper/vg1-lv_XXY /mnt/olddisk/oldroot # mount -o ro /dev/mapper/vg1-lv_XXZ /mnt/olddisk/oldvarYour old fstab should look like this
# cat /mnt/olddisk/oldroot/etc/fstab
You should first check the inode size of your old disk because after migrating a disk with inode size 128 to a disk with inode size 256 which is the default now, grub won't install, you will get an error (The file /boot/grub/stage1 not read correctly, Error 2: Bad File or Directory Type)!/dev/mapper/vg1-lv_XXX / ext3 defaults 1 1 /dev/mapper/vg1-lv_XXY /boot ext3 defaults 1 2 /dev/mapper/vg1-lv_XXZ /var ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/mapper/vg1-lv_swap swap swap defaults 0
# tune2fs -l /dev/sda1 | grep -i 'inode size'
Fdisk your new disk (/dev/sdb)Inode size: 128
I used 2 partitions, sdb1 for the the whole filesystem and of course a small swap sdb2 partition
# fdisk /dev/sdbAfter creating both partitions, give sda1 the bootable flag (a) and change the system id to sdb2 (t, 82).
Format the partitions:
# mkfs.ext3 /dev/sdb1 -I 128
# mkswap /dev/sdb2
Label the partition makes it more convenient for configuring grub and fstab later:I labeled it "root"
# e2label /dev/sdb1 rootMount and prepare the filesystem on new disk:
# mkdir /mnt/newdisk
# mount /dev/sdb1 /mnt/newdisk
# cd /mnt/newdisk; mkdir {dev,mnt,boot,opt,usr,var,tmp,home,data}
Create and configure permissions on /proc, /dev and /sys folders:# mkdir /mnt/newdisk/{proc,dev,sys}
# chmod -w /mnt/newdisk/proc
# chmod go+w /mnt/newdisk/dev
# chmod +t /mnt/newdisk/dev
copy all data from all olddisk mountpoints excluding /dev, /proc and /sys# rsync -avz /mnt/olddisk/oldboot /mnt/newdisk --exclude dev --exclude proc --exclude selinux --exclude sys # rsync -avz /mnt/olddisk/oldroot /mnt/newdisk --exclude dev --exclude proc --exclude selinux --exclude sys ....Adjust some important permissions:
# chmod +t /mnt/newdisk/tmp # chmod go+rw /mnt/newdisk/tmpInstalling grub on new disk requires chrooting:
# mount -o bind /dev /mnt/newdisk/dev
# chroot /mnt/newdisk
# grub
> root (hd1,0)
> setup (hd1)
> quit
Note that hd1 is /dev/sdb1 in our caseFix grub:
# nano /boot/grub/grub.confchange the line containing the image(s):
/boot/vmlinuz-3.2.0-4-686-pae ro root=/dev/mapper/vg1-lv_XXXto
/boot/vmlinuz-3.2.0-4-686-pae ro root=LABEL=rootor by UUID:
/boot/vmlinuz-3.2.0-4-686-pae ro root=UUID=a53bee3f-3a18-45b3-9b7a-8e8e0f2b3e1byou can get your UUID by:
# blkid /dev/sda1Configure fstab:
# nano /etc/fstab
/dev/sda1 / ext3 defaults 1 1 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/sda2 swap swap defaults 0 0I removed all LVM mounts, and configured one mount for my root filesystem, and a second one for swap
You could use disk UUID instead of /dev/sdax:
UUID=a53bee3f-3a18-45b3-9b7a-8e8e0f2b3e1b / ext3 defaults 1 1 UUID=83a41156-85aa-4c40-a6db-b20d42fcb444 swap swap defaults 0 0Exit chroot after saving your fstab:
# exit
