[linux-lvm] Replace small drive with bigger, using LVM?
Andreas Nastke
nastke at gdp-group.com
Thu Sep 11 10:54:27 UTC 2014
are you sure you want to work with a 4TB storage without any kind of
redundancy?
Craig schrieb:
> 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 at 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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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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