VMGuest disk is missing in Xen Orchestra

ashinobi

Hi, Everyone.

May I ask your help about an issue where in the Xen Orchestra one of VMGuest's disk is missing:

It only disappeared in XO because the machine still boots up and I can find it XCP-NG:

[14:35 home-hypervisor ~]# xe vm-disk-list vm=92a2702f-02ed-f7db-3b85-5c1abe2c0175
Disk 0 VBD:
uuid ( RO)             : 13c4c5ba-a00e-9552-294d-acfd124c03b3
    vm-name-label ( RO): WireShark-lab
       userdevice ( RW): 0


Disk 0 VDI:
uuid ( RO)             : d549c8cb-614f-4784-8a54-0b7780ebb192
       name-label ( RW): Wireshark Lab
    sr-name-label ( RO): 1522 NFS share
     virtual-size ( RO): 85899345920

How do I bring it back in XO?

olivierlambert

Hi,

We can't help you with so little information. See https://xen-orchestra.com/docs/community.html#report-a-bug first if you are using XO from the source. Or if it's XOA, tell us if it's on stable or latest.

ashinobi

@olivierlambert

Hi, Olivier

Apologies for that, here are some of the details you need: the XO was from source with commit "8dceb". The VMGuest was a Windows 10 image, the issue started when trying to migrate the VM from a Synology 1522+ to Synology 920+. Both are configured to use NFS.

To double check, I have created another XO from source in VMWare Workstation installed on my workstation, it still cannot see the disk that is associated with the VMguest. If I reboot the VM it was able to reboot without any problem.

olivierlambert

Okay, maybe you are using a snapshot and not a real disk. Paste the result of xe vdi-param-list uuid=d549c8cb-614f-4784-8a54-0b7780ebb192

ashinobi

@olivierlambert

You are right it looks like it is snapshot:

[22:53 home-hypervisor ~]# xe vdi-param-list uuid=d549c8cb-614f-4784-8a54-0b7780ebb192
uuid ( RO)                    : d549c8cb-614f-4784-8a54-0b7780ebb192
              name-label ( RW): Wireshark Lab
        name-description ( RW): Created by XO
           is-a-snapshot ( RO): true
             snapshot-of ( RO): d549c8cb-614f-4784-8a54-0b7780ebb192
               snapshots ( RO): 609538d7-8bd8-4370-8857-d307ba1174e3; d549c8cb-614f-4784-8a54-0b7780ebb192
           snapshot-time ( RO): 20230216T22:29:04Z
      allowed-operations (SRO): snapshot; clone
      current-operations (SRO):
                 sr-uuid ( RO): c98879ee-5f45-6d49-de86-45117298ad02
           sr-name-label ( RO): 1522 NFS share
               vbd-uuids (SRO): 13c4c5ba-a00e-9552-294d-acfd124c03b3
         crashdump-uuids (SRO):
            virtual-size ( RO): 85899345920
    physical-utilisation ( RO): 25722097664
                location ( RO): d549c8cb-614f-4784-8a54-0b7780ebb192
                    type ( RO): User
                sharable ( RO): false
               read-only ( RO): false
            storage-lock ( RO): false
                 managed ( RO): true
     parent ( RO) [DEPRECATED]: <not in database>
                 missing ( RO): false
            is-tools-iso ( RO): false
            other-config (MRW):
           xenstore-data (MRO):
               sm-config (MRO): host_OpaqueRef:3d1b578a-ed85-4986-87de-e46435b3811b: RW; read-caching-enabled-on-2e7b3b4e-fd2a-4013-a859-96209b772873: true; vhd-parent: 063dd2f1-6581-4206-b47e-04fe84acf9ad
                 on-boot ( RW): persist
           allow-caching ( RW): false
         metadata-latest ( RO): false
        metadata-of-pool ( RO): <not in database>
                    tags (SRW):
             cbt-enabled ( RO): false

But I created this image from template. Is that the reason why it is a snapshot and not an actual disk?

olivierlambert

What client did you use to create the VM? It's not normal that your VM is connected to a snapshot disk.

ashinobi

@olivierlambert

Not sure what do you mean by client. the way I created this is using a template that I created:

Please let me know if this not what you needed, and how should I get that information?

olivierlambert

Have you used anything else than Xen Orchestra to create VMs and manage things?

ashinobi

@olivierlambert

Not recently, I have used Xen admin Center initially when I was starting just to deploy Xen Orchestra and after that it is all Xen Orchestra.

olivierlambert

I don't know how you could end by having a snapshot disk as your main disk for a VM

ashinobi

@olivierlambert

I took a snapshot of the vm last 3 Feb 2023, it is still there and I have not deleted it. Is this the reason why encounter this problem?

olivierlambert

No, that's why I don't understand how you could have connected a snapshot disk to the VM in the first place.

ashinobi

@olivierlambert

Is there a way to make the HD visible in XO? If not what is the command to fail it over to different storage in xcp-ng?

olivierlambert

You probably need to transform the disk in a "regular" and not snapshot. It's not a normal use case to use a snapshot as a main VM disk.

ashinobi

@olivierlambert

I do not understand wha t you mean by "You probably need to transform the disk in a "regular" and not snapshot". Not sure on how to do that, please provide the steps or if you have SOP ready, please point me to the SOP document.