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Message #92626
[Bug 2027553] [NEW] "Cannot access backing file, No such file or directory" error when resize instance with ephemeral disks
Public bug reported:
Description
===========
When we resize an instance with flavor with ephemeral disk, it finishes in error state and we have the following error : Cannot access backing file \'/var/lib/nova/instances/_base/ephemeral_30_0cf8804\' of storage file \'/var/lib/nova/instances/<instance_uuid>/disk.local.
The issue happened only when the instance has been initially created with flavor without ephemeral disk.
Steps to reproduce
==================
* Have three compute nodes
* create three "dedicated" flavors called small, medium and large. The small flavor has no ephemeral disk.
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 1024 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 30 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 2048 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 60 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 4096 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 2 |
+----------------------------+--------------------------------------+
* Create the instance with flavor small
* Resize the instance with the flavor medium to the second node
* Check the folder nova_compute/_data/instances/_base on the compute
node where is the vm, you should have the ephemeral disk backing file
for the flavor medium :
ls nova_compute/_data/instances/_base/ephemeral_30_0cf8804
nova_compute/_data/instances/_base/ephemeral_30_0cf8804
* Ensure this file is not present on the another nodes.
* Resize the instance with the flavor large to the third node
* Then you will see the ERROR in nova_compute logs :
libvirt.libvirtError: Cannot access backing file
'/var/lib/nova/instances/_base/ephemeral_30_0cf8804' of storage file
'/var/lib/nova/instances/<instance_uuid>/disk.local'
Expected result
===============
VM resized successfuly, vm state is active
Actual result
=============
* VM become ERROR
* On dashboard you can see this notice:
Please try again later [Error: libvirtError].
** Affects: nova
Importance: Undecided
Status: New
** Tags: train
** Tags added: train
--
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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/2027553
Title:
"Cannot access backing file, No such file or directory" error when
resize instance with ephemeral disks
Status in OpenStack Compute (nova):
New
Bug description:
Description
===========
When we resize an instance with flavor with ephemeral disk, it finishes in error state and we have the following error : Cannot access backing file \'/var/lib/nova/instances/_base/ephemeral_30_0cf8804\' of storage file \'/var/lib/nova/instances/<instance_uuid>/disk.local.
The issue happened only when the instance has been initially created with flavor without ephemeral disk.
Steps to reproduce
==================
* Have three compute nodes
* create three "dedicated" flavors called small, medium and large. The small flavor has no ephemeral disk.
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 0 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 1024 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 30 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 2048 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 1 |
+----------------------------+--------------------------------------+
+----------------------------+--------------------------------------+
| Field | Value |
+----------------------------+--------------------------------------+
| OS-FLV-DISABLED:disabled | False |
| OS-FLV-EXT-DATA:ephemeral | 60 |
| access_project_ids | None |
| description | None |
| disk | 50 |
| id | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx |
| name | medium |
| os-flavor-access:is_public | True |
| properties | |
| ram | 4096 |
| rxtx_factor | 1.0 |
| swap | |
| vcpus | 2 |
+----------------------------+--------------------------------------+
* Create the instance with flavor small
* Resize the instance with the flavor medium to the second node
* Check the folder nova_compute/_data/instances/_base on the compute
node where is the vm, you should have the ephemeral disk backing file
for the flavor medium :
ls nova_compute/_data/instances/_base/ephemeral_30_0cf8804
nova_compute/_data/instances/_base/ephemeral_30_0cf8804
* Ensure this file is not present on the another nodes.
* Resize the instance with the flavor large to the third node
* Then you will see the ERROR in nova_compute logs :
libvirt.libvirtError: Cannot access backing file
'/var/lib/nova/instances/_base/ephemeral_30_0cf8804' of storage file
'/var/lib/nova/instances/<instance_uuid>/disk.local'
Expected result
===============
VM resized successfuly, vm state is active
Actual result
=============
* VM become ERROR
* On dashboard you can see this notice:
Please try again later [Error: libvirtError].
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/2027553/+subscriptions
