[ovirt-users] Re: Cannot delete snapshot
On 22/04/2021 13:20, Shani Leviim wrote:
Hi,
You can use the DeleteImage tool [1], but it's first recommended to
backup your engine.
To be on the safe side, here are some checks it's better to execute
before deleting:
- In order to locate the illegal image, you can run this command on the
host:
vdsm-tool dump-volume-chains <sd_id>
Ok, that is the relevant part of the output:
image: 2fd9b340-14ce-42cd-a880-8f75eb3b72e7
- 19fa612d-2f93-46a5-93e7-c74afc2937fa
status: OK, voltype: INTERNAL, format: COW, legality:
LEGAL, type: SPARSE, capacity: 53687091200, truesize: 45902462976
- e77e2773-eecb-46a6-87c7-14df14f7d95b
status: OK, voltype: LEAF, format: COW, legality: LEGAL,
type: SPARSE, capacity: 53687091200, truesize: 27917287424
So I have on storage two images, first one is a snapshot, second one is
Active VM.
Being the VM up and running I think I could say that on storage the
situation is consistent.
- It's also recommended to verify that the engine and vdsm are synced
about that image, once you've found it, by running this command on the
engine:
SELECT *
FROM images_storage_domain_view images_storage_domain_view
WHERE image_group_id = <image_group_id>;
That's the point: engine (database) sees 3 images, whilst vdsm sees only 2.
And this is output of:
select
image_guid,parentid,imagestatus,vm_snapshot_id,volume_type,volume_format,active
from images where image_group_id='image-group-id';
image_guid | parentid
| imagestatus | vm_snapshot_id | volume_type
| volume_format | active
--------------------------------------+--------------------------------------+-------------+--------------------------------------+-------------+---------------+--------
6180c2e8-141a-4126-bcb1-5af5caa98175 |
19fa612d-2f93-46a5-93e7-c74afc2937fa | 1 |
281a4331-89fa-4544-b6ab-22c0e5ac6459 | 2 | 4 | f
19fa612d-2f93-46a5-93e7-c74afc2937fa |
00000000-0000-0000-0000-000000000000 | 4 |
6488f4c8-efc4-43df-aafc-497fb7d51fbb | 2 | 4 | f
e77e2773-eecb-46a6-87c7-14df14f7d95b |
6180c2e8-141a-4126-bcb1-5af5caa98175 | 1 |
59f69d6f-f300-45e4-8487-1fe4368a5933 | 2 | 4 | t
So there is in the database an image (the one with image-guid
"6180c2e8-141a-4126-bcb1-5af5caa98175") not existing on storage.
[1]
DeleteImage tool:
SELECT DeleteImage('image-id');
DELETE
FROM images
WHERE image_guid = v_image_guid;
I think it could not be enough, I think I should adjust parentship
relations in "images" table.
Just looking at that table it seems not so difficult, but: is it
sufficient? Is it safe?
Regards,
Giulio