[SOLVED] Unable to resize disk size inside the VM (using LVM)

[meepmeep]

Hi

I try to extend one of my VM (debian 8.5) disk size, but it fails every time.

Steps :

• In proxmox hypervisor, select "resize disk", add 10Gb
• Start and stop VM, parted shows the free space on the physical drive with "print free" (free space at the end)

(parted) print free
Model: Virtio Block Device (virtblk)
Disk /dev/vda: 19.3GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start    End      Size     Type      File system  Flags
        0.03MB   1.05MB   1.02MB             Free Space
1      1.05MB   256MB    255MB    primary   ext2         boot
        256MB    257MB    1.05MB             Free Space
2      257MB    10736MB  10479MB  extended
5      257MB    10736MB  10479MB  logical                lvm
        10736MB  19327MB  8591MB             Free Space

• Resizepart of the extended and logical partition to the end size :

resizepart 2 19327
resizepart 5 19327

• Partitions after :

Number  Start    End      Size     Type      File system  Flags
        0.03MB   1.05MB   1.02MB             Free Space
1      1.05MB   256MB    255MB    primary   ext2         boot
        256MB    257MB    1.05MB             Free Space
2      257MB    19327MB  19070MB  extended
5      257MB    19327MB  19070MB  logical                lvm
        19327MB  19327MB  0.35MB             Free Space

• pvresize the physical volume

Before :

  PV Size               9.76 GiB / not usable 2.00 MiB

 $pvresize  --setphysicalvolumesize 19327M /dev/vda5
  WARNING: /dev/vda5: Overriding real size. You could lose data.
  Physical volume "/dev/vda5" changed
  1 physical volume(s) resized / 0 physical volume(s) not resized

After

  PV Size               18.62 GiB / not usable 0

and

  VG Size               18.62 GiB

• lvextend the logical volume

lvextend -l+100%FREE /dev/yolo-vg/root

... and it fails :

  Size of logical volume yolo-vg/root changed from 9.31 GiB (2383 extents) to 18.17 GiB (4652 extents).
  device-mapper: resume ioctl on  failed: Invalid argument
  Unable to resume yolo--vg-root (253:0)
  Problem reactivating root

VM is broken, unable to get a shell, I use a snapshot to revert to previous state :/

So, were am I wrong ?

 

[wolfgang]

Hi,

you forgot to resize the partition before you resize the pv.

 

[meepmeep]

Hi,

How could I resize the partition before the "physical" volume ?? (my logic : Physical -> Volume -> Logical -> Partition)

 

[wbumiller]

Don't use --setphysicalvolumesize when growing, it did tell you you could lose data. If you don't pass a size to it it'll figure out the correct size on its own, which is good especially if eg. your partitioning tool doesn't cause a reload of the table or uses different factors (1000 vs 1024). If it doesn't pick up the size on its own properly try running partprobe (or reboot...).

 

[meepmeep]

Ok, thank you !

Solution :

pvresize /dev/vda5
lvextend -l+100%FREE /dev/yolo-vg/root
resize2fs /dev/yolo-vg/root