Guest Disk Resize SOP

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ISOP:DRESIZE

Resize disks in our Xen guests

Contents

Contact Information

Owner: Fedora Infrastructure Team

Contact: #fedora-admin, sysadmin-main

Location: PHX, Tummy, ibiblio, Telia, OSUOSL

Servers: All xen servers, kvm/libvirt servers.

Purpose: Resize guest disks

How to do it

Xen Guests

  1. SSH to the xen server and resize the guest's logical volume. If you want to be extra careful, make a snapshot of the LV first:
    lvcreate -n [guest name]-snap -L 10G -s /dev/VolGroup00/[guest name] # Optional, but always good to be careful
    lvresize -L [new total size]G /dev/VolGroup00/[guest name]
  2. Shutdown the guest and then start it up again:
    xm shutdown -w [guest name]
    xm create [guest name]
  3. Login into the guest:
    xm console [guest name]
  4. On the guest, run
    fdisk /dev/xvda
  5. Delete the third partition (the LVM partition on the guest) and recreate it with the maximum size. Make sure to set its type to LVM.
  6. Run partprobe:
    partprobe
  7. Check the size of the third partition:
    fdisk -l /dev/xvda3
    If this still reflects the old size, then reboot the guest and verify that its size changed correctly when it comes up again.
  8. Login to the guest again, and run
    pvresize /dev/xvda3
  9. A vgs should now show the new size. Use lvresize to resize the root lv:
    lvresize -L [new root partition size]G /dev/GuestVolGroup00/root
  10. Finally, resize the root partition:
    resize2fs /dev/GuestVolGroup00/root
    , verify that everything worked out, and delete the snapshot you made if you made one.

KVM/libvirt Guests

  1. SSH to the kvm server and resize the guest's logical volume. If you want to be extra careful, make a snapshot of the LV first:
    lvcreate -n [guest name]-snap -L 10G -s /dev/VolGroup00/[guest name] # Optional, but always good to be careful
  2. Shutdown the guest: <pre>sudo virsh shutdown [guest name]
  3. Disable the guests lv:
    lvchange -an /dev/VolGroup00/[guest name]
  4. Resize the lv:
    lvresize -L [NEW TOTAL SIZE]G /dev/VolGroup00/[guest name]
  5. Bring the guest back up:
    sudo virsh start [guest name]
  6. Login into the guest:
    sudo virsh console [guest name]
  7. On the guest, run
    fdisk /dev/vda
  8. Delete the the LVM partition on the guest you want to add space to and recreate it with the maximum size. Make sure to set its type to LVM (8e)
  9. Run partprobe:
    partprobe
  10. Check the size of the partition:
    fdisk -l /dev/vdaN
    If this still reflects the old size, then reboot the guest and verify that its size changed correctly when it comes up again.
  11. Login to the guest again, and run
    pvresize /dev/vdaN
  12. A vgs should now show the new size. Use lvresize to resize the root lv:
    lvresize -L [new root partition size]G /dev/GuestVolGroup00/root
  13. Finally, resize the root partition:
    resize2fs /dev/GuestVolGroup00/root
    , verify that everything worked out, and delete the snapshot you made if you made one.