> I installed Ubuntu 16.04 64-bit onto a 500 GB drive, and would like to
> migrate the entire installation to a larger drive. S
As always, there's more than one way to do it. All of them start with
making sure you have a backup in case things go horribly wrong. After
that, here's what I'd do:
1) Shut down the system
2) Plug in the new drive, in addition to the old drive
3) Boot up a rescue CD/DVD/USB drive. Anything that can get you to a
memory-based Linux prompt will do. CentOS/RedHat/Ubuntu installation
DVDs all have a rescue system on them, as I imagine do most others.
4) Become root, and run "dd if=/dev/OLDDRIVE of=/dev/NEWDRIVE bs=5120",
replacing OLDDRIVE and NEWDRIVE with the appropriate drives. You can
use fdisk -l to see the drives and their sizes, to be sure the rescue
system named the disks the way you expect.
5) Power down and remove the old drive. At that point you can boot and
run on the new drive, but you don't have any more space yet.
6) Boot up from the hard disk and add a new partition on the new drive
covering the added space. Depending on your system, you may need to
reboot or run partprobe on the disk for the kernel to recognize the new
partition.
7) Extend your volume group onto the new partition. If your volume
group is called "system" and your new partition is /dev/sda7: vgextend
system /dev/sda7. You know what partition you created, and you can
enter "vgdisplay" to see your volume group name if you don't know it.
Step 4 is the most delicate -- if you cross up your drives you'll
overwrite your data, so make sure you get those right.
After that, you're done. Your volume group uses space off of two (or
more) partitions on the same disk, but it will happily spread logical
volumes across them if it needs to, so that's not a problem. There are
other approaches that involve making the original LVM partition bigger,
but they're more involved without much benefit over this approach.
-Brian Martin
--
--------------------
Brian P. Martin, Chief Consultant
Martin Consulting Services, Inc.
Phone: 503-617-4500
E-mail: [email protected]
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