Migrating VM fails with DUPLICATE_VM error

Zevgeny

Sorry for my noobishness, I visually checked each VM on the destination host in XO's GUI, and none of them have that UUID.
I also have another VM that cannot migrate, which has a different UUID.

Am I only interested in the UUID of the VM? Or are there additional layers of UUID that I also need to check? (eg. snapshots, VDIs, etc?)

Is there a shell command I can run to list all UUIDs on the host?

olivierlambert

If there's a duplicate UUID due of an interrupted previous migration, you won't be able to see it in XO sadly (UUID should be truly unique, but there's some edge cases where it's not).

SSH to the destination host, and do a xe vm-list | grep bb75397d-980e-9fd8-aa63-c8b13c38bd3e.

Destroy this VM first.

Zevgeny

@olivierlambert Ok, so I ran the command without the grep on destination and source (grep doesnt find anything.)

I couldn't see the UUIDs of the VMs I want to migrate anywhere on the destination list.

The two VMs I am trying to migrate on the source:

[17:54 xcp-ks ~]# xe vm-list
uuid ( RO)           : bb75397d-980e-9fd8-aa63-c8b13c38bd3e
     name-label ( RW): Win10 Print Server
    power-state ( RO): halted

uuid ( RO)           : 5c27c06b-0995-73c6-bb2d-d442db947ee8
     name-label ( RW): WIN10 Print Release Terminal
    power-state ( RO): halted

My VM list on the destination:

[17:50 xcp-city ~]# xe vm-list
uuid ( RO)           : 3b6f09b1-8d47-7478-b72e-2dd53788a57e
     name-label ( RW): MLS-VM-Ubuntu_2020-06-29T04:01:46.552Z
    power-state ( RO): halted


uuid ( RO)           : 280cf6a8-7c56-9323-0148-ce048a4081d4
     name-label ( RW): WServer2019-PublicFacing_2020-05-17T16:51:13.772Z
    power-state ( RO): halted


uuid ( RO)           : 9eff99d0-a16b-d91d-5f41-d36e24357ec8
     name-label ( RW): WServer2019-HiSec_2020-06-15T07:59:15.309Z
    power-state ( RO): halted


uuid ( RO)           : d5896b2d-bb75-262f-9d55-668315419306
     name-label ( RW): MLS-VM-SMTP
    power-state ( RO): running


uuid ( RO)           : 826f34bd-aaaa-2bdd-61fe-2511f843d713
     name-label ( RW): WS-PubNet_2020-06-29T04:57:59.732Z
    power-state ( RO): halted


uuid ( RO)           : a55b24bc-02b9-4dcd-a7fc-05f8f107660e
     name-label ( RW): Control domain on host: xcp-city
    power-state ( RO): running


uuid ( RO)           : 2617b8ed-a087-e257-4ca2-0e44de5b8ee9
     name-label ( RW): WS-MSAdmin_2020-06-26T03:03:27.154Z
    power-state ( RO): halted


uuid ( RO)           : 08d020c9-6314-9c6b-3792-dba8f1d2f15d
     name-label ( RW): WServer2019-HiSec_2020-06-14T06:48:02.042Z
    power-state ( RO): halted


uuid ( RO)           : 6d98ba66-09ad-3754-ef14-ee4a8035717a
     name-label ( RW): WS-PubNet_2020-06-26T05:16:37.397Z
    power-state ( RO): halted


uuid ( RO)           : d513e984-5ef6-ad7f-8ae0-18c483718f23
     name-label ( RW): WServer2019-PublicFacing_2020-05-22T12:57:51.293Z
    power-state ( RO): halted


uuid ( RO)           : 522e6da7-25e7-22bb-dbda-1584a5c851cf
     name-label ( RW): XO CE Kubuntu
    power-state ( RO): running


uuid ( RO)           : fe1f5255-4779-7510-e657-5e259032bf6a
     name-label ( RW): MLS-VM-Ubuntu
    power-state ( RO): running


uuid ( RO)           : 84876754-324b-aedd-fea4-7e358d0dd74c
     name-label ( RW): WS-MSAdmin
    power-state ( RO): running


uuid ( RO)           : a0921e9a-bb0e-6555-e1ea-8546afa3dd55
     name-label ( RW): WServer2019-HiSec_2020-06-15T03:32:08.343Z
    power-state ( RO): halted


uuid ( RO)           : 6a1d28d8-f30a-74e8-3ad9-9a1fe6b37e13
     name-label ( RW): WS-PubNet
    power-state ( RO): running


uuid ( RO)           : 2662852b-8a39-07f9-7a2c-de7e85c1ab76
     name-label ( RW): XO CE Kubuntu_2020-03-16T00:16:43.655Z
    power-state ( RO): halted


uuid ( RO)           : b1390286-0569-e935-b922-89aa7aaf670c
     name-label ( RW): [XO Backup Backup XO CE Kubuntu] XO CE Kubuntu
    power-state ( RO): halted


uuid ( RO)           : 0da8353c-7ce9-543c-1448-ecaa3df96573
     name-label ( RW): WS-HiSec
    power-state ( RO): running

shorian

@zevgeny @olivierlambert For anyone that comes across this under a different guise - we found exactly the same issue and couldn't work out why some VMs were migrating just fine and others were not.

It turned out that we are running a Continuous Replication task which means that there is a UUID conflict when moving the relevant VM across.

So we have Primary Host A & Secondary Host B. The VM is running on the Primary, and we use CR to keep a copy on the Secondary. However, when we want to upgrade the Primary without causing downtime on the VM, we attempt to migrate VM to the Secondary but it fails, as we already have the CR entity on that host.

I can see why this occurs - we are trying to create two versions of the same VM on the same host, however I'd have thought that the Use Case was fairly common. Primary Server running, replicates to a Secondary Server, but wants to move running VM to avoid downtime without having to delete the replicas in case there are any issues. With a copied VM the UUID conflict does not occur, but with the migrate it does.

(In our case, on each host we have a large SATA array for backups that we replicate to, with live VMs running off the SSD array. Hence there is still value in keeping the replica - it protects against disk failure or corruption despite being on the same host for a short period whilst we upgrade the Primary).

Discussion - should one be permitted to update the UUID for replicas (perhaps under advanced settings in Backups?) to avoid these conflicts - or would it cause more widespread issues? Or is our Use Case unique ?

Thanks!

olivierlambert

CR isn't duplicating any VM UUID (it's a new VM created on destination).

shorian

That's strange. When I checked the UUID with 'xe vm-list | grep UUID' on the target host I got the 'importing...CR...' item, when I deleted it the same error persisted although the offending item was no longer present in vm-list. Only when I deleted all CR replicas could I get the migration to complete. Has been reproducible - I will investigate further and revert over the next week.

olivierlambert

It might also be related to another duplicated UUID somewhere else in the object.

Feel free to post the result of xe vm-param-list between both VMs (the one replicated on the original one). Maybe we can spot what's going on

wcom939

@olivierlambert I know I'm chiming in here quite late but I'm also facing the same issue, and the machine uuid is not on the destination server.

I have 3 xcp-ng servers, I want to migrate from Server C to B, all 3 are independent pools and the same XCP-NG version.

da010bca-fa81-629c-5b25-ea16f03e9510 is the UUID of the VM I'm looking to move

Server C:
uuid ( RO)           : 4104416d-2539-411d-8d73-3590865eca4d
     name-label ( RW): Control domain on host: localhost
    power-state ( RO): running


uuid ( RO)           : da010bca-fa81-629c-5b25-ea16f03e9510
     name-label ( RW): AZUREDIRSYNC
    power-state ( RO): running

Server B:

uuid ( RO)           : 907bf603-49df-dc36-fc9a-9bb706f12cc8
     name-label ( RW): F2VMSBODOOIT001
    power-state ( RO): halted


uuid ( RO)           : 62d721e2-0ef0-4d37-5858-d754369825f7
     name-label ( RW): F2VMSBSSOXIT002
    power-state ( RO): running


uuid ( RO)           : 7af2c68c-7fde-c3c3-38a3-3e107412537e
     name-label ( RW): xenorchestrav2
    power-state ( RO): running


uuid ( RO)           : 695a14bf-37f0-05b5-7141-ed1be479b0de
     name-label ( RW): Spiceworks-Fourman-Household
    power-state ( RO): running


uuid ( RO)           : 9c13dfc9-0e57-4da0-93dd-8bbfbc850cb4
     name-label ( RW): Control domain on host: localhost
    power-state ( RO): running


uuid ( RO)           : 6cd8e824-a5c0-c521-9f1d-bf768e3b9999
     name-label ( RW): F2VMSBODOOIT001_2021-04-01T21:40:16.406Z
    power-state ( RO): halted


uuid ( RO)           : 82c805a7-e79a-6d85-8ad6-1e8a08efce23
     name-label ( RW): F2VMSBWADMIT001
    power-state ( RO): halted


uuid ( RO)           : f0d98192-bb27-129a-4cec-7ef9d4dac880
     name-label ( RW): F2VMSBDBNOIT004
    power-state ( RO): halted


uuid ( RO)           : 35357e77-8a48-f523-5abd-dbb1da560b00
     name-label ( RW): F2VMSBINVXIT001
    power-state ( RO): running


uuid ( RO)           : 350e0434-2cab-c3eb-0d22-48d4f38d7997
     name-label ( RW): F2VMSBWWWXIT001
    power-state ( RO): running


uuid ( RO)           : 4db452a8-a06d-ff74-3ddb-7df3fad3e1c5
     name-label ( RW): F2VMSBSSOXIT001
    power-state ( RO): running


uuid ( RO)           : 5d229ce2-9a31-aabe-d250-7f1ff377c551
     name-label ( RW): F2VMSBODOOIT001_2021-04-01T18:53:52.769Z
    power-state ( RO): halted

Getting the following error in both xcp-ng center and XO:

vm.migrate
{
  "vm": "da010bca-fa81-629c-5b25-ea16f03e9510",
  "mapVdisSrs": {
    "dd58e003-a906-420f-8f41-a96d1d42e087": "41587f9b-a755-03f8-1fa1-e80d18c2e8b1"
  },
  "mapVifsNetworks": {
    "b37022e9-031d-04aa-f574-92102095b6ad": "89375484-4323-e6c1-542b-cb993b4272c4"
  },
  "migrationNetwork": "93b5130a-6c13-9218-9588-582a9379bef4",
  "sr": "41587f9b-a755-03f8-1fa1-e80d18c2e8b1",
  "targetHost": "126c62b2-aacb-4f5a-b6bc-12865592ed20"
}
{
  "code": 21,
  "data": {
    "objectId": "da010bca-fa81-629c-5b25-ea16f03e9510",
    "code": "DUPLICATE_VM"
  },
  "message": "operation failed",
  "name": "XoError",
  "stack": "XoError: operation failed
    at factory (/opt/xen-orchestra/packages/xo-common/src/api-errors.js:21:32)
    at /opt/xen-orchestra/packages/xo-server/src/api/vm.js:487:15
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at runNextTicks (internal/process/task_queues.js:62:3)
    at processImmediate (internal/timers.js:434:9)
    at process.topLevelDomainCallback (domain.js:144:15)
    at process.callbackTrampoline (internal/async_hooks.js:129:14)
    at Object.migrate (/opt/xen-orchestra/packages/xo-server/src/api/vm.js:474:3)
    at Api.callApiMethod (/opt/xen-orchestra/packages/xo-server/src/xo-mixins/api.js:304:20)"
}

Thanks,
Dan

olivierlambert

Can you try with xe command to see if you have the same error?

impovich

@olivierlambert having exactly the same issue as wcom939 reported.
What did you mean by "Can you try with xe command to see if you have the same error?" ? Migrate using CLI? there are too many options:)