Guest Disk Resize SOP

   Resize disks in our Xen guests

   Contents

     * 1 Contact Information
     * 2 How to do it

          * 2.1 KVM/libvirt Guests

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

  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:

 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. Enable the lv:

 lvchange -ay /dev/VolGroup00/[guest name]

    6. Bring the guest back up:

 sudo virsh start [guest name]

    7. Login into the guest:

 sudo virsh console [guest name]

    8. On the guest, run

 fdisk /dev/vda

    9. 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)
   10. Run partprobe:

 partprobe

   11. 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.
   12. Login to the guest again, and run

 pvresize /dev/vdaN

   13. 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

   14. Finally, resize the root partition:

 resize2fs /dev/GuestVolGroup00/root

       , verify that everything worked out, and delete the snapshot you made
       if you made one.