OpenStack Compute (nova)

  1. Bug #1369465
  2. Comment #8

Comment 8 for bug 1369465

Revision history for this message
Liang Chen (cbjchen) wrote : Re: nova resize doesn't resize(extend) rbd disk files when using rbd disk backend

Hi,

I just came across the same problem and took a look at the code. Below is some of my findings.

1. disk_info is not passed to finish_migration, thus no disk resize operation is even attempted.
At https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L6036, network type isn't considered a valid disk type and migrate_disk_and_power_off uses this code to load the disk info that will be eventually feeded to finish_migration to determine if a disk resize is required, https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L6401 .

2. resizing rbd backed disk is not supported

Even if disk_info is successfully passed to finish_migration, the _disk_resize function invoked at https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L6404 doesn't support rbd backed disk. All it does at the end is a qemu-img resize call - https://github.com/openstack/nova/blob/master/nova/virt/disk/api.py#L190.

Hope it helps.

Thank,
Liang