0

I'm able to dd my Ubuntu installation from an SD card to my finally-arrived SSD and boot it, but as soon as I resize the partition (using gparted from a livecd), it stops booting. I've tried reinstalling grub2 and nothing. It works again when I dd from the SD again, but I can't get the partition expanded. I'm using ext2, but I want to convert it to btrfs and also add a swap partition.

  • Is your SD a bootable? Does it have a 'live' system on it, or a regular install? A 'live' system is a special case with a compressed read-only root file-system. For you SSD, you probably don't want a 'live' system, you want a regular Linux install. – Gregor Feb 14 '17 at 15:27
  • It is a regular install. Since this post I've expanded by partition, but btrfs doesn't work and I can't find a decent guide to make it work as my boot partition – Eric Wolf Feb 15 '17 at 14:00
  • I use btrfs a lot as my root file-system, but I still use a smaller ext4 as my boot partition (containing the kernel, initrd, grub or extlinux). Booting directly from btrfs is still not fully supported, I think. – Gregor Feb 16 '17 at 18:16
0

I would recommend creating a 2GB ext4 boot partition on the SSD, then copying your kernel and initrd into that.

If you want to just copy your SD rootfs onto the SSD, I don't think dd is the best approach. I do something like:

mkdir /bind
mount -o bind / /bind
cd /bind
cp -a . /path/to/new/root/subvol/

Then you will have to edit the new fstab to make sense,

LABEL={ssd-btrfs-label}  /  btrfs noatime,subvol={new-root-subvol}
LABEL={ssd-boot-label}   /boot ext4 noatime

then, boot to the new rootfs by booting from your sd, and editing the kernel command-line to add/change:

 root=LABEL={btrfs-filesystem-label}
 rootflags=noatime,subvol={new-root-subvol}

After booting into your new system, you can use grub-install to install the boot-loader properly on the SSD.

Depending on your kernel and hardware, you can tweak performance with other mount options:

 lazytime,nodatacow

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.