Move LVM storage

[Kaya]

Hi,
I need to move kvm disk between LVM disk.
Actually, I have 4 physical volume (each made by 2 600gb SAS disk in MIRROR mode).
For disk space I need to move, for example, vm-126-disk-1 from VM4 to VM.
I didn't find anything on wiki useful.
Can someone show me the right way?

(OMG I'm really tired and my english is terrible, I hope it's understandable enought)

My configuration

 pveversion  -v
proxmox-ve-2.6.32: 3.2-126 (running kernel: 2.6.32-29-pve)
pve-manager: 3.2-4 (running version: 3.2-4/e24a91c1)
pve-kernel-2.6.32-19-pve: 2.6.32-96
pve-kernel-2.6.32-16-pve: 2.6.32-82
pve-kernel-2.6.32-29-pve: 2.6.32-126
pve-kernel-2.6.32-14-pve: 2.6.32-74
pve-kernel-2.6.32-26-pve: 2.6.32-114
lvm2: 2.02.98-pve4
clvm: 2.02.98-pve4
corosync-pve: 1.4.5-1
openais-pve: 1.1.4-3
libqb0: 0.11.1-2
redhat-cluster-pve: 3.2.0-2
resource-agents-pve: 3.9.2-4
fence-agents-pve: 4.0.5-1
pve-cluster: 3.0-12
qemu-server: 3.1-16
pve-firmware: 1.1-3
libpve-common-perl: 3.0-18
libpve-access-control: 3.0-11
libpve-storage-perl: 3.0-19
pve-libspice-server1: 0.12.4-3
vncterm: 1.1-6
vzctl: 4.0-1pve5
vzprocps: 2.0.11-2
vzquota: 3.1-2
pve-qemu-kvm: 1.7-8
ksm-control-daemon: 1.1-1
glusterfs-client: 3.4.2-1

Yeah I know it's quite old but I plan to upgrade next month.
vgs:

  VG   #PV #LV #SN Attr   VSize   VFree
  VM     1  14   0 wz--n- 500.00g  89.00g
  VM2    1   3   0 wz--n- 557.86g 307.86g
  VM3    1   1   0 wz--n- 557.86g 157.86g
  VM4    1   4   0 wz--n- 557.86g 275.86g

pvs

PV                                  VG   Fmt  Attr PSize   PFree
  /dev/mapper/222310001555f77ef-part1 VM   lvm2 a--  500.00g  89.00g
  /dev/mapper/VM2_multipath           VM2  lvm2 a--  557.86g 307.86g
  /dev/mapper/VM3_multipath           VM3  lvm2 a--  557.86g 157.86g
  /dev/mapper/VM4_multipath           VM4  lvm2 a--  557.86g 275.86g

lvs

LV            VG   Attr      LSize   Pool Origin Data%  Move Log Copy%  Convert
  vm-100-disk-1 VM   -wi-ao---  16.00g
  vm-101-disk-1 VM   -wi-ao---  20.00g
  vm-101-disk-2 VM   -wi-ao---   8.00g
  vm-103-disk-1 VM   -wi-ao---  32.00g
  vm-105-disk-2 VM   -wi-ao---  22.00g
  vm-106-disk-1 VM   -wi-ao---  32.00g
  vm-106-disk-2 VM   -wi-ao--- 100.00g
  vm-111-disk-1 VM   -wi-ao---  24.00g
  vm-111-disk-2 VM   -wi-a----   1.00g
  vm-112-disk-1 VM   -wi-ao---  20.00g
  vm-112-disk-2 VM   -wi-ao---   1.00g
  vm-113-disk-1 VM   -wi-a---- 100.00g
  vm-114-disk-1 VM   -wi-a----  15.00g
  vm-128-disk-1 VM   -wi------  20.00g
  vm-119-disk-1 VM2  -wi-ao---  50.00g
  vm-122-disk-1 VM2  -wi-ao--- 100.00g
  vm-124-disk-1 VM2  -wi-ao--- 100.00g
  vm-120-disk-1 VM3  -wi-ao--- 400.00g
  vm-120-disk-1 VM4  -wi-ao--- 100.00g
  vm-123-disk-1 VM4  -wi-ao--- 100.00g
  vm-125-disk-1 VM4  -wi-ao---  50.00g
  vm-126-disk-1 VM4  -wi-ao---  32.00g

 

[m.ardito]

Hi,
are VM and VM4 seen as two separate storages by pve datacenter storage?

If yes, you simply can live migrate each VM disk with the gui.
select the disk and use "move disk" option...

Marco

 

[Kaya]

Where exactly?
I can find migration only in Virtual machine gui..

 

[m.ardito]

select a VM,
move to the hardware tab
select a disk to be moved => the "move disk" button becomes available
click "move disk" button, you are shown a little form
choose target storage and maybe check "delete source" (after it's been moved, if move fails, nothing is deleted)

Marco

 

[Kaya]

YEah, you're right. I havent't seen that button.
Now I try to move.
Questione: better if I shut down the VM or is not necessary?

 

[m.ardito]

Questione: better if I shut down the VM or is not necessary?

Not necessary. Going live (VM running) sometimes it fails: I usually just retry and it works.
If it fails again, retrying after stopping the VM has never failed to me...
anyway, it' so easy

Marco

 

[Kaya]

Yeah, now I'm trying with small (32gb) disk with live mode but I see IOWait to grow too much(till 20% ).
I will try in offline mode next time to see if IOWait will be lover.