I have a workstation that can only take 2 hard drives.
The one that's in there is a 500GB drive and I'd like to bring a new 4TB
drive in and use LVMto migrate a live running system over to the new
drive, remove the old one from the setup, reboot and bing, have the
large drive running,without having to re-install my OS and set up
everything afresh.
It's an Ubuntu 14.04.1 install where I ticked the "Use LVM" tick box
# fdisk -l
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005d771
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 499711 248832 83 Linux
/dev/sda2 501758 976771071 488134657 5 Extended
/dev/sda5 501760 976771071 488134656 8e Linux LVM
Disk /dev/sdb: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders, total 7814037168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xc73f6184
Device Boot Start End Blocks Id System
/dev/sdb1 2048 499711 248832 83 Linux
/dev/sdb2 499712 4294967294 2147233791+ 5 Extended
/dev/sdb5 501760 4294967294 2147232767+ 8e Linux LVM
Disk /dev/mapper/ubuntu--vg-root: 493.4 GB, 493363396608 bytes
255 heads, 63 sectors/track, 59981 cylinders, total 963600384 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/ubuntu--vg-root doesn't contain a valid partition table
Disk /dev/mapper/ubuntu--vg-swap_1: 6438 MB, 6438256640 bytes
255 heads, 63 sectors/track, 782 cylinders, total 12574720 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/ubuntu--vg-swap_1 doesn't contain a valid partition table
So /dev/sda is the original install disk and /dev/sdb in my shiny new WD
Black 4TB drive.
# vgdisplay
--- Volume group ---
VG Name ubuntu-vg
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 465.52 GiB
PE Size 4.00 MiB
Total PE 119173
Alloc PE / Size 119162 / 465.48 GiB
Free PE / Size 11 / 44.00 MiB
VG UUID tFSX8N-c3zG-j9BW-yqx2-Or63-AXMg-Sho5tD
root@home:~# lvdisplay
--- Logical volume ---
LV Path /dev/ubuntu-vg/root
LV Name root
VG Name ubuntu-vg
LV UUID rqvzFC-b1I2-sLRm-oq6w-fTEP-UGSe-7E7fwz
LV Write Access read/write
LV Creation host, time ubuntu, 2014-08-15 14:24:31 +0100
LV Status available
# open 1
LV Size 459.48 GiB
Current LE 117627
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Path /dev/ubuntu-vg/swap_1
LV Name swap_1
VG Name ubuntu-vg
LV UUID y9fXgx-ceMm-lss0-ZZi8-d2us-KdGT-ipUQQ4
LV Write Access read/write
LV Creation host, time ubuntu, 2014-08-15 14:24:31 +0100
LV Status available
# open 2
LV Size 6.00 GiB
Current LE 1535
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1
So I've got /boot in a primary partition and then swap and / come via
LVM in the extended.
So I'd love to do something like
* dd /dev/sda1 to /dev/sdb1 or something like that and have my /boot
volume set up
* install grub into the MBR of /dev/sdb
The if I can make the right LVM setup, get / from my live system copied
to the new drive, remove the old drive lv from the vg and then
physically swap the HDDs round.
Can someone help me with the finer details of this or isn't it doable?
TIA
-C
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