XenAPI: nova-compute fails when snapshotting VM with attached volumes

[Roman Sokolkov]

I use XCP 1.4.90-53341c and VM with nova-compute , as controller used external host with ubuntu 12.04.

I have VM with attached volume.
root@ubuntu:/opt/stack/nova# nova volume-list
+--------------------------------------+--------+--------------+------+-------------+--------------------------------------+
| ID | Status | Display Name | Size | Volume Type | Attached to |
+--------------------------------------+--------+--------------+------+-------------+--------------------------------------+
| 4856cb42-2918-4f69-a828-f5509f4389cc | in-use | None | 1 | None | 1ed7dd1b-6e4e-4362-a2ca-dfcaa33c0f9d |
+--------------------------------------+--------+--------------+------+-------------+--------------------------------------+

root@ubuntu:/opt/stack/nova# nova image-create 1ed7dd1b-6e4e-4362-a2ca-dfcaa33c0f9d newnew
root@ubuntu:/opt/stack/nova# nova image-list
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| ID | Name | Status | Server |
+--------------------------------------+---------------------------------+--------+--------------------------------------+
| 069a449a-d9a2-4484-bbca-6f87850d239b | newnew | SAVING | 1ed7dd1b-6e4e-4362-a2ca-dfcaa33c0f9d |
| 1447dca1-ac58-4772-9bd7-49dfd262c6a4 | cirros-0.3.0-x86_64-uec-ramdisk | ACTIVE | |
| ed1d3d36-c183-468c-94a8-077bdbdca8e8 | cirros-0.3.0-x86_64-uec | ACTIVE | |
| f78a6d4f-611b-491e-afcb-9beea9b8d51d | cirros-0.3.0-x86_64-uec-kernel | ACTIVE | |
+--------------------------------------+---------------------------------+--------+--------------------------------------+

And snapshotting fails with http://paste.openstack.org/show/18205/ on nova-compute

This is because there are iscsi targets attached to instance and it is analogue if I tried "xe vm-snapshot"

xe vm-snapshot uuid=0de1f9b2-07a9-98ac-7c67-47b1126c4b31 new-name-label=newnew
The SR backend does not support the operation (check the SR's allowed operations)
sr: FA15E-D15C-4856cb42-2918-4f69-a828-f5509f4389cc (tempSR-4856cb42-2918-4f69-a828-f5509f4389cc)

As described for libvirt https://github.com/openstack/nova/commit/7dbf9c7de23623223ef60c0566d9330797c5f87e
we must use only root devices, instead fully snapshotting.

[John Garbutt (johngarbutt)]

Seems like a real bug, need to look only taking a snapshot of the root image.

[clayg (clay-gerrard)]

I'm not able to reproduce this after Change-Id: I3e2973747135a9c33de194e38537620c397bb87e (35952750) was merged to master.

It was apparently more closely related to Bug #1028092 than I realized.

[Yaguang Tang (heut2008)]

@clayg is correct , bug #1028092 has fixed this bug.