Resize LUKS

Resize LUKS

Resizing LUKS+LVM2?+ext3 after replacing the harddisk with a larger one.

1.  Setup

• Aluminium Powerbook 1.25GHz 15" (Powerboook5,2)
• 80GB HDD (Fujitsu MHT2080AT? 4200rpm)
• /dev/hda14 LUKS partition "cryptroot"
• LVM2? volume group "vgroot" on "cryptroot"
• LVM2? logical volumes "lvroot" "lvhome" "lvtmp" "lvusr" "lvvar" on "vgroot"

1.1  New hardware

• 160GB HDD (Seagate ST9160821A? 5400rpm)

2.  Partition Maps

To display:

  parted /dev/hda unit s p 

2.1  Old

Partitions on old 80GB disk

#	name	Start	End	#Sectors	Size	Comment
1	Apple	1	63	63	31.5K	Apple partition map
2	Macintosh	64	119	56	28K	Apple_Driver43
3	Macintosh	120	175	56	28K	Apple_Driver43
4	Macintosh	176	231	56	28K	Apple_Driver_ATA
5	Macintosh	232	287	56	28K	Apple_Driver_ATA
6	Macintosh	288	799	512	256K	Apple_FWDriver
7	Macintosh	800	1311	512	256K	Apple_Driver_IOKit
8	Patch Partition	1312	1823	512	256K	Apple patch partition
9	Untitled	1824	41945088	41943265	20G	OS X root
10	Shared	41945089	111151104	69206016	33G	Shared ext3
11	bootstrap	111151105	111152704	1600	800K	NewWorld? bootblock
12	boot	111152705	111314943	162239	79.22M	/boot
13	swap	111314944	113282623	1967680	960.78M	swap
14	linux	113282624	156301487	43018864	20.51G	root, LUKS, LVM2?

2.2  Intermediate

Old partitions on new 160GB disk with gaps for expansion

#	name	Start	End	#Sectors	Size	Comment
1	Apple	1	63	63	31.5K
2	Macintosh	64	119	56	28K
3	Macintosh	120	175	56	28K
4	Macintosh	176	231	56	28K
5	Macintosh	232	287	56	28K
6	Macintosh	288	799	512	256K
7	Macintosh	800	1311	512	256K
8	Patch Partition	1312	1823	512	256K
9	OSX	1824	41945088	41943265	20480.11M
	FREE	41945089	83887903	41942815	20479.89M
10	Shared	83887904	153093919	69206016	33792M
	FREE	153093920	209717023	56623104	27648M
11	bootstrap	209717024	209718623	1600	800K
12	boot	209718624	209880862	162239	79.22M
	FREE	209880863	209980767	99905	48.78M
13	swap	209980768	212077919	2097152	1024.0M	new size
14	linux	212077920	255096783	43018864	21005.3M
	FREE	255096784	312581807	57485024	28068.86M

2.3  New

New expanded partitions on new disk.

#	name	Start	End	#Sectors	Size	Comment
1	Apple	1	63	63	31.5K
2	Macintosh	64	119	56	28.0K
3	Macintosh	120	175	56	28.0K
4	Macintosh	176	231	56	28.0K
5	Macintosh	232	287	56	28.0K
6	Macintosh	288	799	512	256.0K
7	Macintosh	800	1311	512	256.0K
8	Patch Partition	1312	1823	512	256.0K
9	OSX	1824	41945088	41943265	20480.1M
10	OSX-2	41945089	83887903	41942815	20479.9M
11	Shared	83887904	209717023	125829120	60.0M
12	bootstrap	209717024	209718623	1600	800.0K
13	boot	209718624	209980767	262144	128.0M
14	swap	209980768	212077919	2097152	1024.0M
15	linux	212077920	312581807	100503888	47.9M

In moving from 80GB to 160GB:

• OSX is expanding¹ from 20GiB to 40GiB
• Shared is expanding from 33GiB to 60GiB
• /boot is expanding from 80MiB to 128MiB
• swap is expanding from 960MiB to 1024MiB
• root is expanding from 20GiB to ~50GiB

3.  Process

3.1  Overview

Migrate data from dying 80GB disk to new 160GB disk, keeping data intact including LUKS partition with LVM2? inside. Resize partitions to take advantage of the bigger disk.

3.2  Download Finnix

http://www.finnix.org/

Burn to CD and boot.

wget http://www.finnix.org/releases/90.0/finnix-ppc-90.0.iso
cdrecord -v dev=/dev/cdrw ./finnix-ppc-90.0.iso

3.3  Create partitions

Create partitions of the same size (but not necessarily at the same start sector) on new disk manually with parted.

Creating a new partition:

# parted /dev/hda
(parted) unit s
(parted) mkpart root START_SECTOR END_SECTOR

START_SECTOR and END_SECTOR same as old partition map

"unit s" tells parted to work in sector-sized units

Sectors are 512 bytes

3.4  Enlarge shared

Use parted to extend the ext3 partition and fs

parted /dev/hda unit s resize 10 83887904 209717023

3.5  Enlarge boot

Use parted to extend the ext3 partition and fs

parted /dev/hda unit s resize 12 209718624 209980767

That was easy.

3.6  Enlarge swap

Nothing to do, the encrypted swap gets recreated on each boot. So just resize the partition.

3.7  Enlarge root

Decrypt

cryptsetup luksOpen /dev/hda14 cryptroot

Activate volume group and logical volumes

vgchange -a y

Resize the physical volume

pvresize /dev/mapper/cryptroot

Enlarge the logical volumes

lvextend -L +10G vgroot/lvhome

3.8  Enlarge OS X

HFS+ can't be enlarged without a third-party utility.

So create a new partition instead. To be used as an encrypted Home partition through FileVault?.

parted /dev/hda unit s mkpart 41945089 83887903

Did this last because I wasn't sure if it would shift all the partition numbers off.

It didn't. The new OSX partition became /dev/hda15.