Extending LVM on VM

[Tomas Kucera]

Hi there, I would like to extend xxx-root LVM, that is mounted on /.

I had extended the physical volume using the PVE UI, so the sda shows size of 450GB, so there is 200GB available, which I want to allocate to sda2 and then use to extend the xxx-root to use all of the available free space.

Any way to achieve it safely without deleting and re-creating the partition (from obivous reason - data loss)?

Thanks in advance!

tom.+

NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda            8:0    0   450G  0 disk
├─sda1         8:1    0     1G  0 part /boot
└─sda2         8:2    0   249G  0 part
  ├─xxx-root 253:0    0    50G  0 lvm  /
  ├─xxx-swap 253:1    0   3.9G  0 lvm  [SWAP]
  └─xxx-home 253:2    0 195.1G  0 lvm  /home

 

[waltar]

Change correctly to your dm name !!
1) lvextend -l +100%FREE /dev/mapper/xxx-root
2a) resize2fs -p /dev/mapper/xxx-root # for ext*
2b) xfs_growfs /dev/mapper/xxx-root # for xfs
or as all-in-one
3) lvextend --resizefs -l +100%FREE /dev/mapper/xxx-root

Check new size with df

 

[Tomas Kucera]

Hi, sorry, missed your response.

I've tried this but it does nothing.

> lvextend -l +100%FREE /dev/mapper/xxx-root says:
New size (12801 extents) matches existing size (12801 extents).

> lvextend --resizefs -l +100%FREE /dev/mapper/xxx-root says:
Size of logical volume cl_sail/root unchanged from 50.00 GiB (12801 extents).

So, I am a but stuck here. :/

 

[Tomas Kucera]

Hi there, anyone any idea on this? Thanks!

 

[waltar]

What says "parted -l" ?

 

[Tomas Kucera]

Output below. It confirms that the /dev/mapper/xxx-root has not been extended.

Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sda: 483GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system  Flags
 1      1049kB  1075MB  1074MB  primary  xfs          boot
 2      1075MB  268GB   267GB   primary               lvm

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/xxx-home: 210GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End    Size   File system  Flags
 1      0.00B  210GB  210GB  xfs

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/xxx-swap: 4161MB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End     Size    File system     Flags
 1      0.00B  4161MB  4161MB  linux-swap(v1)

Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/xxx-root: 53.7GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Disk Flags:
Number  Start  End     Size    File system  Flags
 1      0.00B  53.7GB  53.7GB  xfs

 

[waltar]

Your problem is your partitioning as you just gave 267 GB in part-2 to lvm and so lvm cannot extend further to it's volumes than that.
You could try to resize your part-2 to full size of the disk or do a part-3 on sda and give that additional space over tp lvm.

 

[Tomas Kucera]

I am somewhat noob in this. Would you, please, check this for me, if this is correct and that it will not cause data loss (of course backup before doing it)?

- to extend the sda2 to use 100% of the available disk space:

parted /dev/sda resizepart 2 100%

- assign the space to the xxx-root:

lvextend -l +100%FREE /dev/mapper/xxx-root
resize2fs /dev/mapper/xxx-root

Thanks in advance!

 

[waltar]

Looks good.

 

[Tomas Kucera]

Ufff ... I am running somewhat ancient CentOS Linux 7 (Core) ... but found a solution:

yum install cloud-utils-growpart
growpart /dev/sda 2
pvresize /dev/sda2
lvextend -l +100%FREE /dev/mapper/xxx-root
lvresize --extents +100%FREE --resizefs /dev/mapper/xxx-root

Thanks @waltar for hinting.