resize a instance,then revert the resize,excute cold migrate,error using ceph

[byhan]

1.version: kilo&&liberty

 2.Relevant log files:

2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher six.reraise(self.type_, self.value, self.tb)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 3895, in _finish_resize
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher block_device_info, power_on)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 6848, in finish_migration
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher fallback_from_host=migration.source_compute)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 2861, in _create_image
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher instance, size, fallback_from_host)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py", line 6282, in _try_fetch_image_cache
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher size=size)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 240, in cache
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher *args, **kwargs)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 783, in create_image
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher self.verify_base_size(base, size)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher File "/usr/lib/python2.7/dist-packages/nova/virt/libvirt/imagebackend.py", line 290, in verify_base_size
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher flavor_size=base_size, image_size=size)
2016-02-24 16:45:20.549 1660 ERROR oslo_messaging.rpc.dispatcher FlavorDiskSmallerThanImage: Flavor's disk is too small for requested image. Flavor disk is 21474836480 bytes, image is 1073741824 bytes

3.Reproduce steps:
  3.1 resize a instance,Let us assume that it is testVM
  3.2 rever the resize
  3.3 cold migrate testVM

Expected result: cold migrate sucess
Actual result: cold migrate failed

[Eli Qiao (taget-9)]

hi

 I don't get your issue, please see below steps, can you detail your environment and your steps?

ubuntu@lm-1:~/devstack$ nova list
+--------------------------------------+-------+---------------+------------+-------------+---------------------------------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-------+---------------+------------+-------------+---------------------------------------------------------+
| 0cb800cb-6803-4403-976a-32c00f736cdc | test2 | VERIFY_RESIZE | - | Running | private=fd3f:22c2:65e6:0:f816:3eff:fef5:544a, 10.0.0.13 |
+--------------------------------------+-------+---------------+------------+-------------+---------------------------------------------------------+
ubuntu@lm-1:~/devstack$ nova resize-revert test2

ubuntu@lm-1:~/devstack$ nova list
virsh li+--------------------------------------+-------+---------------+------------------+-------------+---------------------------------------------------------+
| ID | Name | Status | Task State | Power State | Networks |
+--------------------------------------+-------+---------------+------------------+-------------+---------------------------------------------------------+
| 0cb800cb-6803-4403-976a-32c00f736cdc | test2 | REVERT_RESIZE | resize_reverting | Running | private=fd3f:22c2:65e6:0:f816:3eff:fef5:544a, 10.0.0.13 |
+--------------------------------------+-------+---------------+------------------+-------------+---------------------------------------------------------+
----------------------------------------------------

ubuntu@lm-1:~/devstack$ nova show test2
+--------------------------------------+----------------------------------------------------------------------------------+
| Property | Value |
+--------------------------------------+----------------------------------------------------------------------------------+
| OS-DCF:diskConfig | MANUAL |
| OS-EXT-AZ:availability_zone | az2 |
| OS-EXT-SRV-ATTR:host | lm-2 |
| OS-EXT-SRV-ATTR:hostname | test2 |
| OS-EXT-SRV-ATTR:hypervisor_hostname | lm-2 |
| OS-EXT-SRV-ATTR:instance_name | instance-00000011 |
| OS-EXT-SRV-ATTR:kernel_id | a80c2821-0ffc-42f6-941d-aae8b7011044 |
| OS-EXT-SRV-ATTR:launch_index | 0 ...

[byhan (2005hanbaoying)]

before cold migrate,you should resize the instance and then revert the resize

besides,the instance must be launched by image. using ceph

I have read the source ,find bug in here:
after resize, we will enlarge the size of image_cache
code path:D:\nova\nova\virt\libvirt\imagebackend.py

def create_image(self, prepare_template, base, size, *args, **kwargs):

        if not self.check_image_exists():
            prepare_template(target=base, max_size=size, *args, **kwargs)

        # prepare_template() may have cloned the image into a new rbd
        # image already instead of downloading it locally
        if not self.check_image_exists():
            self.driver.import_image(base, self.rbd_name)
        self.verify_base_size(base, size)

        if size and size > self.get_disk_size(self.rbd_name):
            self.driver.resize(self.rbd_name, size)

revert the resize ,the size of this image_cache did not become small
but the flavor become the smaller one

 means that:
 when cold migrate the instance, as we know running the same code as resize in openstack.
we will found flavor size is smaller than image_cache

verify_base_size throw exception

[Augustina Ragwitz (auggy)]

It looks like you've reported this issue against kilo and liberty, which are both at end of life. Can this issue be reproduced in Mitaka or in the current master?

[Markus Zoeller (markus_z) (mzoeller)]

Comment #2 gives the asked information. Liberty hasn't reached EOL yet. The report should be re-evaluated.

[John Garbutt (johngarbutt)]

I am calling this confirmed due to: 1599067

[Sean Dague (sdague)]

Automatically discovered version kilo in description. If this is incorrect, please update the description to include 'nova version: ...'