XenOrchestra not showing VM Disks on Pool (on single Server working) - XCP-ng Center is showing them

[olivierlambert]

Ping @anthoineb because it might be related to an XCP-ng bug

[Pilow]

@AlexD2006 could you check directly in the disks tab of the SR if all VDIs have a snapshot icon on them ?

[AlexD2006]

@Pilow
Indeed.
Thats exactly the Point.

All my VMs that ran into my nightly Backups, have this.
To test it i created a new VM that didnt get a snapshop yet.
In the new VM i see the Disks.

[Pilow]

@AlexD2006 this is a current bug, not solved yet

you could try that on one VM : snapshot it, revert to snapshot (VDIs will re appear in the disk tab of the VM), then delete snapshot.
rince & repeat for each VM...

problem of disappearing VDIs could come again.

There is no harm to the VMs, in XO6 you should see the VDIs are there (like in XCPNG Center).
xo-cli calls also work normal.

[Pilow]

@AlexD2006 see here, we're in the same boat
https://xcp-ng.org/forum/topic/11715/vdi-not-showing-in-xo-5-from-source.

[AlexD2006]

@Pilow

Thanks for your Reply.
Just one little correction.
Also in XO6, the Disks are missing in the VM-VDI Tab.
Its exactly the same in XO5 and XO6.
Only in XCP-ng Center i see the Disks.

I noticed an additional thing.
In the Health-Dashboard, i see one orphaned "base copy" for each Disk that is adressed by this behaviour.

Exactly the amount of Disks of all my VMs with this problem.
(in the screenshot only the two of the VM of the former screenshots)
I am shure there are no orphaned VDIs, its just the base-copies of all my active Disks.

I think this could be possibly extremely dangerous, if someone has the same problem and removes the orphanes at this point.

But maybe i am too paranoid here?

[acebmxer]

@AlexD2006

Yes while this can be a scarry situation there have been multiple post about his. @pilow has been dealing with it the longs I believe.

Some have tried @pilow suggestion and have been good since. I would see if you can create test vm or copy one of the existing ones to try with braking a production vm.

[Pilow]

@AlexD2006 you are right, this is dangerous.
I also have them old & dusty base copies from the seventies

do not shoot them.

[Pilow]

if you have other SRs, migrating VDIs/VMs is known to correct the "visual issue"

the bug just populates a metadata of the VDI making XOA Web UI believe it's a snapshot, and it is not...

a dev told us in another thread they are on it, but it will be a two phase remediation I believe, correcting the bug so that it doesn't reproduce and a way to script out this metadata on impacted VDIs

this is only guesses

[AlexD2006]

@Pilow
@acebmxer

Thanx for your replies.
And sorry, i havent seen your first reply between my last posts with the link to your existing Thread.

So, i think this is some kind of a bigger thing.
Will handle with care, but i have to leave for today.
Maybe i have time to test the snapshot and revert workarounds on the weekend.
But these are all production VMs.
Have to coordinate.
I have 2 NFS-SRs in the Pool.
Will try to migrate VMs from one to the other and see if this helps.

Kind Regards and thx again
Alex

[conitrade-as]

Same problem here. But I noticed it only appears with the latest updates from XCP-ng 8.3. The log file shows me the following packages were updated / installed on my host:

May 07 19:44:54 Updated: xen-libs-4.17.6-6.2.xcpng8.3.x86_64
May 07 19:44:54 Updated: gnutls-3.3.29-10.2.xcpng8.3.x86_64
May 07 19:44:54 Updated: 1:net-snmp-libs-5.9.3-8.2.xcpng8.3.x86_64
May 07 19:44:54 Updated: ipmitool-1.8.19-11.2.xcpng8.3.x86_64
May 07 19:44:54 Updated: openssh-9.8p1-1.2.3.xcpng8.3.x86_64
May 07 19:44:54 Updated: openssh-clients-9.8p1-1.2.3.xcpng8.3.x86_64
May 07 19:44:54 Updated: openssh-server-9.8p1-1.2.3.xcpng8.3.x86_64
May 07 19:44:54 Updated: 1:net-snmp-agent-libs-5.9.3-8.2.xcpng8.3.x86_64
May 07 19:44:55 Updated: 1:net-snmp-5.9.3-8.2.xcpng8.3.x86_64
May 07 19:44:55 Updated: blktap-3.55.5-6.7.xcpng8.3.x86_64
May 07 19:44:55 Updated: message-switch-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:55 Updated: xcp-ng-xapi-plugins-1.16.0-1.xcpng8.3.noarch
May 07 19:44:55 Updated: xen-hypervisor-4.17.6-6.2.xcpng8.3.x86_64
May 07 19:44:55 Updated: xen-dom0-libs-4.17.6-6.2.xcpng8.3.x86_64
May 07 19:44:56 Updated: vhd-tool-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:56 Updated: squeezed-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:56 Updated: xen-tools-4.17.6-6.2.xcpng8.3.x86_64
May 07 19:44:56 Updated: xen-dom0-tools-4.17.6-6.2.xcpng8.3.x86_64
May 07 19:44:57 Updated: xcp-rrdd-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:57 Updated: xapi-tests-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:57 Updated: xo-lite-0.20.0-1.xcpng8.3.noarch
May 07 19:44:57 Updated: wsproxy-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:58 Updated: xapi-storage-script-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:58 Updated: xcp-networkd-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:59 Updated: forkexecd-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:59 Updated: sm-cli-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:44:59 Updated: xapi-rrd2csv-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:00 Updated: rrdd-plugins-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:01 Updated: xapi-nbd-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:01 Updated: sm-fairlock-3.2.12-17.8.xcpng8.3.x86_64
May 07 19:45:01 Updated: sm-3.2.12-17.8.xcpng8.3.x86_64
May 07 19:45:01 Updated: xenopsd-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:01 Updated: xenopsd-cli-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:02 Updated: xenopsd-xc-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:05 Updated: xcp-ng-pv-tools-8.3-17.xcpng8.3.noarch
May 07 19:45:05 Installed: 3:traceroute-2.1.5-2.xcpng8.3.x86_64
May 07 19:45:05 Updated: xapi-xe-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:05 Updated: qcow-stream-tool-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:08 Updated: xapi-core-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:08 Updated: xcp-ng-deps-8.3-14.noarch
May 07 19:45:08 Updated: gnutls-utils-3.3.29-10.2.xcpng8.3.x86_64
May 07 19:45:08 Updated: gnutls-devel-3.3.29-10.2.xcpng8.3.x86_64
May 07 19:45:09 Updated: varstored-guard-26.1.3-1.10.xcpng8.3.x86_64
May 07 19:45:12 Updated: kernel-4.19.19-8.0.46.2.xcpng8.3.x86_64

So I guess one of these packages could be the culprit?

[conitrade-as]

Another interesting observation. On a VM where we took a snapshot today (post Windows Update install) and deleted an older snapshot, the disk shows up (both v5 and v6).

[conitrade-as]

Dug a little deeper. For a VM where the disks are not shown the following XO API call fails:

/rest/v0/vms/a519e879-3971-9210-51b6-7df14336e7b7/vdis
{
  "error": "no such VDI ac37700d-3157-4df7-b8e8-e1799a994591",
  "data": {
    "id": "ac37700d-3157-4df7-b8e8-e1799a994591",
    "type": [
      "VDI"
    ]
  }
}

Also the VDI cannot be retrieved over the XO API:

/rest/v0/vms/a519e879-3971-9210-51b6-7df14336e7b7
...
 "$VBDs": [
    "4ea8a3cd-0d1b-dc60-4d9c-fd70e060f06c",
    "9f4ca686-9fc2-35a9-c3e9-c871c9f68aba"
  ],
...

/rest/v0/vbds/9f4ca686-9fc2-35a9-c3e9-c871c9f68aba
{
  "type": "VBD",
  "attached": false,
  "bootable": false,
  "device": "xvda",
  "is_cd_drive": false,
  "position": "0",
  "read_only": false,
  "VDI": "ac37700d-3157-4df7-b8e8-e1799a994591",
  "VM": "a519e879-3971-9210-51b6-7df14336e7b7",
  "id": "9f4ca686-9fc2-35a9-c3e9-c871c9f68aba",
  "uuid": "9f4ca686-9fc2-35a9-c3e9-c871c9f68aba",
  "$pool": "93d361b7-f549-53b7-a3aa-c9695bf0abe4",
  "$poolId": "93d361b7-f549-53b7-a3aa-c9695bf0abe4",
  "_xapiRef": "OpaqueRef:1d424d94-f540-2eb4-9e52-2a9b21ec0a19"
}

/rest/v0/vdis/ac37700d-3157-4df7-b8e8-e1799a994591
{
  "error": "no such VDI ac37700d-3157-4df7-b8e8-e1799a994591",
  "data": {
    "id": "ac37700d-3157-4df7-b8e8-e1799a994591",
    "type": "VDI"
  }
}

However the VDI can be listed using the xe cli:

$ xe vm-list uuid=a519e879-3971-9210-51b6-7df14336e7b7
uuid ( RO)           : a519e879-3971-9210-51b6-7df14336e7b7
     name-label ( RW): XXX
    power-state ( RO): halted

$ xe vbd-list vm-uuid=a519e879-3971-9210-51b6-7df14336e7b7
uuid ( RO)             : 4ea8a3cd-0d1b-dc60-4d9c-fd70e060f06c
          vm-uuid ( RO): a519e879-3971-9210-51b6-7df14336e7b7
    vm-name-label ( RO): XXX
         vdi-uuid ( RO): <not in database>
            empty ( RO): true
           device ( RO): xvdd


uuid ( RO)             : 9f4ca686-9fc2-35a9-c3e9-c871c9f68aba
          vm-uuid ( RO): a519e879-3971-9210-51b6-7df14336e7b7
    vm-name-label ( RO): XXX
         vdi-uuid ( RO): ac37700d-3157-4df7-b8e8-e1799a994591
            empty ( RO): false
           device ( RO): xvda

$ xe vdi-list uuid=ac37700d-3157-4df7-b8e8-e1799a994591
uuid ( RO)                : ac37700d-3157-4df7-b8e8-e1799a994591
          name-label ( RW): XXX Disk 0
    name-description ( RW): Created by XO
             sr-uuid ( RO): 977b7e63-bb84-57b2-3e0d-206afea553bf
        virtual-size ( RO): 34359738368
            sharable ( RO): false
           read-only ( RO): false

Seems almost like something changed in the XCP-ng API which XO cannot consume.