VDI not showing in XO 5 from Source.

[Pilow]

I am also impacted on some SRs, latest XOA 6.0.3

In the VM DISKS tab, no disk

VM is running OK. can snapshot, can backup.

on the impacted SR (local RAID5 for this one) I noted that there is no more green progress bar as if SR is empty, but showing 47 VDIs and occupied space OK :

DISKS tab of the SR is showing the VDIs on the running VMs :

as @danp asked, check of params on one impacted VDI & VBD :

# xe vdi-param-list uuid=a81ecd87-3788-4528-819d-7d7c03aa6c61
uuid ( RO)                    : a81ecd87-3788-4528-819d-7d7c03aa6c61
              name-label ( RW): xxx-xxx-xxxxxx_sda
        name-description ( RW):
           is-a-snapshot ( RO): false
             snapshot-of ( RO): f9cbd30f-a261-4b95-97db-b6846147634a
               snapshots ( RO): cb65b96a-bed9-4e9a-82d3-e73b5aed546d
           snapshot-time ( RO): 20250912T17:38:57Z
      allowed-operations (SRO): snapshot; clone
      current-operations (SRO):
                 sr-uuid ( RO): b1b80611-7223-c829-8953-6aa2bf5865b3
           sr-name-label ( RO): xxx-xx-xxxxxxx RAID5 Local
               vbd-uuids (SRO): 51bb1797-c6c7-50f0-13a9-dfaad4c99d90
         crashdump-uuids (SRO):
            virtual-size ( RO): 68719476736
    physical-utilisation ( RO): 30686765056
                location ( RO): a81ecd87-3788-4528-819d-7d7c03aa6c61
                    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): vhd-parent: daeee201-3891-443e-8bdb-b00ed1051279; host_OpaqueRef:3e7283ba-5a42-1881-958a-9f96b71fb98f: RW; read-caching-enabled-on-f2868da5-4509-43d7-9ef9-2bb3857e1ba5: true
                 on-boot ( RW): persist
           allow-caching ( RW): false
         metadata-latest ( RO): false
        metadata-of-pool ( RO): <not in database>
                    tags (SRW):
             cbt-enabled ( RO): true

# xe vbd-param-list uuid=51bb1797-c6c7-50f0-13a9-dfaad4c99d90
uuid ( RO)                        : 51bb1797-c6c7-50f0-13a9-dfaad4c99d90
                     vm-uuid ( RO): 108ad69b-1fa5-d80b-fb16-a62509ad642a
               vm-name-label ( RO): xxx-xxx-xxxxxx
                    vdi-uuid ( RO): a81ecd87-3788-4528-819d-7d7c03aa6c61
              vdi-name-label ( RO): xxx-xxx-xxxxxx_sda
          allowed-operations (SRO): attach; unpause; pause
          current-operations (SRO):
                       empty ( RO): false
                      device ( RO): xvda
                  userdevice ( RW): 0
                    bootable ( RW): false
                        mode ( RW): RW
                        type ( RW): Disk
                 unpluggable ( RW): false
          currently-attached ( RO): true
                  attachable ( RO): true
                storage-lock ( RO): false
                 status-code ( RO): 0
               status-detail ( RO):
          qos_algorithm_type ( RW):
        qos_algorithm_params (MRW):
    qos_supported_algorithms (SRO):
                other-config (MRW): owner:
                 io_read_kbs ( RO): 0.000
                io_write_kbs ( RO): 93.752

VDI seen as a snapshot...
in XO6, VDI appears ok.
we have an internal webapp that access by API and disk appears OK, like in XO6.

seems to be rooted on the SR, not the VMs, as the entire SR is impacted... ? not all SRs in this XOA instance are impacted (have other RAID5 local SR and iSCSI SRs)
all VMs hosted on this SR have invisible disks in XO5

have an XO CE attached to same servers, and same behavior, invisible disks

edit :
on GENERAL tab of an impacted VM :

we can see a 0Bytes VDI, but activity

[Pilow]

tried to deploy a NEW vm for testing purpose on an impacted SR :

and it appears ! it's the only VDI visible, there are OTHER vms on this same SR that have invisible disks

all as if nothing

I guess we could migrate the impacted VMs out of this SR and back, and it would correct the issue !

does that help ?!

[olivierlambert]

@anthoineb or someone from the @team-storage, you might want to take a look (IDK if it's a known problem internally)

[anthoineb]

@olivierlambert Yes, we saw this before, we are investigating.

[olivierlambert]

Thanks!

[wilsonqanda]

Hello All,

Found some roundabout solutions you may want to try:
https://xcp-ng.org/forum/post/101370

[Pilow]

@wilsonqanda tried your workaround on a halted VM, and it worked !
If i snapshot -> disk still invisible
delete snapshot - > disk still invisible

but

if i snapshot --> disk still invisible
revert snapshot (with take snapshot option) --> disk APPEAR again
delete the two snapshots -> disks still there

edit : even without the take snapshot before revert, it is working, tried on another VM

[wilsonqanda]

@Pilow Lol glad I was able to help. Its only if you have a few VMs having hundreds will be a nightmare... giod luck to those that has that issue. In the meantime I will use the method I mention for now.

[Pilow]

@wilsonqanda @anthoineb @olivierlambert

we are now impacted on a SR that didn't have the problem... now all disks are invisible and DASHBOARD/HEALTH show some strange dates on base copies...

halt/snap/revert correct the issue but needs to be done on each VM

all VDIs seem to be regrouped strangely on unique base copy

there is something seriously wrong happening

no impact on production of VMs though, just management issues in XOA web ui
even backups are OK.

halp.

[Pilow]

i could be wrong but in

/usr/local/lib/node_modules/xo-server/dist/xapi-object-to-xo.mjs

I see a lot of

if (obj.is_a_snapshot || obj.$snapshot_of !== undefined)

seems to be a way of managing both "old version" and "new version" (or "broader version") to define if a VDI is a snapshot
there has been an evolution in the code at some point ?

and someone somewhere in recent updates (10 dec) forgot the || on some important action

my recent SR problem appeared when I was snapshoting/deleting VDI/reverting snapshot
all VMs suddenly didn't have visible VDIs anymore on the whole SR.

I could be wrong, but the fact that ALL VDIs are now seen as snapshot seems smelly with this ||

https://github.com/vatesfr/xen-orchestra/commit/85596da79217070bf4431135bbb5b0d2cf04e45b

0 spacotte-vates committed to vatesfr/xen-orchestra

fix(xo-server): improve handling of xapi snapshots (#9231)

In some cases, when converting an xapi object into an xo object, the xapi.is_a_snapshot param may be set to false even tho the xapi.snapshotOf refers to another xapi object. Handle this case better.

[wilsonqanda]

@Pilow now that you mention that everything is seen as snapshot i remember all my ISO are seen as snapshots too... so most iso cannot be mounted until i drag them in a folder then put them back in same folder so XO could reprocess all the iso correctly. This might be a related issue to all the snapshots for the VMs.

[Pilow]

@wilsonqanda strangely my ISOs were not impacted, except for the default XCP TOOLS iso that seems gone

the "base copy" regroup bug on homepage of the SR, and the orphan base copies in the DASHBOARD/HEALTH seems to be linked to same problem

we have much fast clones VMs depending on those base copies seen as orphan

we are narrowing on the problem, just need the dev to level it, have faith

[wilsonqanda]

@Pilow Check the iso does it have a snapshot icon in the drive?

Next it show up fine until u want to create a vm in the new vm pg it think they are snapshots and you cant select the ISOs. This is when the problem arise.

Yep the dev here are super reaponsive. Have been a long term user and here and love their support . I mostly just been playing with things and learn so much by tinkering

[Pilow]

@wilsonqanda it's an SMB iso SR on my end, I think this is why it is not impacted

can't snapshot a file on Microsoft SMB share

[wilsonqanda]

@Pilow my is SMB too but it saw the issue. I use windows to login and drag all iso into a new created folder in the iso folder and drag it back out delete the newly created folder and all my iso is back to normal. It was a quick thing.

[Pilow]

@wilsonqanda HAHA. problem resolved instantly for me on last SR I had the troubles

playing with the "rescan all ISO SRs" made the guest tools iso reappear

AND ALL MY OTHER VDIs ON THIS SR/HOST that were invisible

donnnnn't ask me HOW...

but this trick didn't work on other local RAID5 SR that have the problem