# Changing the boot disk via sunstone removes CPU\_MODEL from the vm configuration

**URL:** <https://forum.opennebula.io/t/changing-the-boot-disk-via-sunstone-removes-cpu-model-from-the-vm-configuration/14416>\
**Category:** Bug Reporting\
**Created:** [March 5, 2026, 7:53pm UTC](https://forum.opennebula.io/t/changing-the-boot-disk-via-sunstone-removes-cpu-model-from-the-vm-configuration/14416 "2026-03-05T19:53:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![twa](https://avatars.discourse-cdn.com/v4/letter/t/bb73d2/32.png) [@twa](https://forum.opennebula.io/u/twa)\
**Post date:** [March 5, 2026, 7:53pm UTC](https://forum.opennebula.io/t/changing-the-boot-disk-via-sunstone-removes-cpu-model-from-the-vm-configuration/14416/1 "2026-03-05T19:53:16Z")

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Please, describe the problem here and provide additional information below (if applicable) …

* * *

**Versions of the related components and OS (frontend, hypervisors, VMs):**

OpenNebula 7.0, KVM Nodes

**Steps to reproduce:**

Edit the Configuration of a VM via “Update VM Configuration” in SunStone, go to Boot order and select any disk, click on “Accept”

**Current results:**

the CPU\_MODEL parameter gets removed from the VM configuration and needs to be re-added with onevm updateconf

**Expected results:**

change of boot order without messing up the VM configuration

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**Author:** ![FrancJP](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/francjp/32/7690_2.png) [@FrancJP](https://forum.opennebula.io/u/FrancJP)\
**Post date:** [March 9, 2026, 4:21pm UTC](https://forum.opennebula.io/t/changing-the-boot-disk-via-sunstone-removes-cpu-model-from-the-vm-configuration/14416/2 "2026-03-09T16:21:27Z")

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Hello @twa,

Thanks for raising this issue on the category 😉

From what I could investigate, there’s a workaround for this:

- Modify the boot order via CLI using `onevm updateconf` instead of Sunstone.
- Define `CPU_MODEL` in the original VM template so it is preserved during UI edits.

In any case, my suggestion would be file an issue on the OpenNebula repo:  
[Github Repo](https://github.com/OpenNebula/one/issues), so the technical team can review it better and give you a more technical reply.

Regards,

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**Author:** ![system](https://canada1.discourse-cdn.com/flex031/uploads/opennebula/original/2X/1/14d66f1130b9cd292905f575da9b68a9f574dd03.png) [@system](https://forum.opennebula.io/u/system)\
**Post date:** [April 8, 2026, 4:21pm UTC](https://forum.opennebula.io/t/changing-the-boot-disk-via-sunstone-removes-cpu-model-from-the-vm-configuration/14416/3 "2026-04-08T16:21:44Z")

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