Grub - Revision history

Andrew: /* Moving root partition to a new disk */

2021-02-04T20:19:50Z

‎Moving root partition to a new disk

Andrew at 14:03, 4 February 2021

2021-02-04T14:03:09Z

Andrew at 08:05, 4 February 2021

2021-02-04T08:05:23Z

Andrew: /* Moving boot record and /boot to a new disk */

2021-02-04T00:36:16Z

‎Moving boot record and /boot to a new disk

Andrew: /* Moving boot record and /boot to a new disk */

2016-04-24T18:49:45Z

‎Moving boot record and /boot to a new disk

Andrew: Created page with "== Moving boot record and /boot to a new disk == * Setup new disk with GPT partition table * For BIOS (not EFI) booting, create a ~1MB partition at the start of the disk, with..."

2016-04-24T18:48:23Z

Created page with "== Moving boot record and /boot to a new disk == * Setup new disk with GPT partition table * For BIOS (not EFI) booting, create a ~1MB partition at the start of the disk, with..."

New page

== Moving boot record and /boot to a new disk ==
* Setup new disk with GPT partition table
* For BIOS (not EFI) booting, create a ~1MB partition at the start of the disk, with the bios_grub flag
* Create a boot partition (but don't set the boot flag)
* Use the remainder of the space as desired
* Example "parted /dev/sdX -- print free" for a bootable drive:
<pre>
Model: ATA ST3320620A (scsi)
Disk /dev/sde: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number Start End Size File system Name Flags
1 17.4kB 1049kB 1031kB bios bios_grub
2 1049kB 2000MB 1999MB ext4 boot
3 2000MB 320GB 318GB ext4 tmp
320GB 320GB 335kB Free Space
</pre>
* Mount new boot partition at /mnt, and copy boot partition onto it:
<pre>
mount /dev/sdXY /mnt
cp -a /boot/* /mnt
</pre>
* Edit /etc/fstab and change /boot partition mount to UUID for new partition (use /dev/disk/by-uuid to determine partition uuid)
* Unmount existing /boot, and mount new /boot
<pre>
umount /boot
mount /boot
</pre>
* Install grub boot loader into the bios partition, using the /boot partition for OS loading. Note that the disk is specified, rather than a partition:
<pre>
grub-install /dev/sdX
</pre>
* Update grub to match the new partition layout:
<pre>
update-grub
</pre>

← Older revision		Revision as of 20:19, 4 February 2021
Line 47:		Line 47:
	== Moving root partition to a new disk ==		== Moving root partition to a new disk ==
	https://superuser.com/questions/615956/how-can-i-specify-a-different-disk-to-be-root-in-grub-cfg-when-running-grub-mkco		https://superuser.com/questions/615956/how-can-i-specify-a-different-disk-to-be-root-in-grub-cfg-when-running-grub-mkco
		+
		+	Ensure you also change the boot order in your motherboard BIOS if you've installed the boot sector to a new drive.

← Older revision		Revision as of 14:03, 4 February 2021
Line 44:		Line 44:
	This file is no longer generated (or kept up to date) by default in recent grub versions, since it's largely unused. To update it manually:		This file is no longer generated (or kept up to date) by default in recent grub versions, since it's largely unused. To update it manually:
	sudo grub-mkdevicemap		sudo grub-mkdevicemap
		+
		+	== Moving root partition to a new disk ==
		+	https://superuser.com/questions/615956/how-can-i-specify-a-different-disk-to-be-root-in-grub-cfg-when-running-grub-mkco

← Older revision		Revision as of 08:05, 4 February 2021
Line 40:		Line 40:
	</pre>		</pre>
	* Restart (or halt and disconnect old drive), and cross your fingers!		* Restart (or halt and disconnect old drive), and cross your fingers!
		+
		+	== Updating /boot/grub/device.map ==
		+	This file is no longer generated (or kept up to date) by default in recent grub versions, since it's largely unused. To update it manually:
		+	sudo grub-mkdevicemap

← Older revision		Revision as of 18:49, 24 April 2016
Line 36:		Line 36:
	update-grub		update-grub
	</pre>		</pre>
		+	* Restart (or halt and disconnect old drive), and cross your fingers!

@@ Line 1: / Line 1: @@
 == Moving boot record and /boot to a new disk ==
 * Setup new disk with GPT partition table
-* For BIOS (not EFI) booting, create a ~1MB partition at the start of the disk, with the bios_grub flag
+* For BIOS (not EFI) booting, create a ~2MB partition at the start of the disk, with the bios_grub flag
 * Create a boot partition (but don't set the boot flag)
 * Use the remainder of the space as desired
 * Example "parted /dev/sdX -- print free" for a bootable drive: