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    Lost VMs disk after using new SR

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    • D Offline
      DaleDibbadel
      last edited by

      xcp used dellr640 dis pool as vm store, 4TB, single disk. it was local SR.
      Brought in trunas, set a SR device: /dev/sda, rebooted Dell, now VMs wont start.
      Current issue:
      Your SR metadata is partially lost.
      Specifically:
      The VDI files exist
      But XAPI has lost the VM ↔ VDI attachment records (VBDs)
      That is why:
      SR scan complains
      VMs have no disks
      XO only shows “Other install media”
      This is classic SR metadata desync, usually caused by:
      SR delete/recreate
      Interrupted SR introduce
      xapi restart during SR changes...
      How can I still use my current VM data?

      I am deep in the chatGPT hole.
      Any help is greatly warrantedScreen Shot 2025-12-29 at 22.27.52 PM.png Screen Shot 2025-12-29 at 22.28.19 PM.png Screen Shot 2025-12-29 at 22.28.25 PM.png Screen Shot 2025-12-29 at 22.28.53 PM.png .

      1 Reply Last reply Reply Quote 0
      • olivierlambertO Online
        olivierlambert Vates 🪐 Co-Founder CEO
        last edited by

        Hi,

        Can you explain yourself (without the help of ChatGPT) exactly what you did in the first place to get into that situation? It's not clear to me 🤔

        D 1 Reply Last reply Reply Quote 0
        • DanpD Online
          Danp Pro Support Team
          last edited by

          @DaleDibbadel said in Lost VMs disk after using new SR:

          Brought in trunas, set a SR device: /dev/sda, rebooted Dell, now VMs wont start.

          Please elaborate on the exact commands that you ran here. Also, you may want to provide the output from lsblk to provide some additional context.

          Do you have a backup of your pool metadata?

          D 1 Reply Last reply Reply Quote 0
          • D Offline
            DaleDibbadel @olivierlambert
            last edited by

            @olivierlambert Hi, this was built out with x1 4tb ssd, used as local SR.
            I add a truenas data set, and deleted the old SR, reboot Dell host, then VMs showed no disk.
            Checked vates support, went to where metadata would be, the DIR showed empty, chat gpt declared data was still there but XCP-NG did not see it without metadata.

            I have since added another 4TB to the Dell460 host pool, giving xcp-ng 8TB.
            Eventually I will add more 4TB to = x8, so far I have 2.
            With Dell, I can add to it's pool and xcp will see.

            Question:
            What is best practice for data recovery, so I do not have to rebuild again?
            I can't seem to find where the snapshots and backup save to.
            I plan to use snapshots this time, and backup VM to trunas
            XO runs on a separate lenovo box.
            I did view: https://docs.xcp-ng.org/management/backup/#xen-orchestra

            My mind is telling me snapshots, and backup VM data to a truenas data set rather then local SR on XCP.

            Do I have to back up vm data and it's metadata separate?
            I am more so reaching for help on best backup practices, I am rebuilding VMs,Screen Shot 2025-12-30 at 07.43.50 AM.png Screen Shot 2025-12-30 at 07.43.47 AM.png

            1 Reply Last reply Reply Quote 0
            • D Offline
              DaleDibbadel @Danp
              last edited by

              @Danp I do not, I did not know it was needed. Last cmd run, blew away old SR, using new pool.

              Type "xsconsole" for access to the management console.
[00:09 localhost ~]# xe sr-list
uuid ( RO)                : bda59d9a-5655-e903-c569-02c8e1c84465
          name-label ( RW): VM-Pool
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): ext
        content-type ( RO): user


uuid ( RO)                : 5ee50bda-201e-633c-ea4c-4ba32b2a0428
          name-label ( RW): casaHOS-NextCloud
    name-description ( RW): casaHOS-NextCloud
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : ae10e37f-237a-d62e-8146-1b9aeeae0562
          name-label ( RW): TrueNAS-ISO
    name-description ( RW): ISOs on trunas
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 405be593-196a-e6c1-1154-737d870ca2c8
          name-label ( RW): DVD drives
    name-description ( RW): Physical DVD drives
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): iso


uuid ( RO)                : d076f279-50f3-906a-f29b-a20822dba819
          name-label ( RW): Local-ISO
    name-description ( RW): 
                host ( RO): <not in database>
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : c360423b-dbc3-833c-a77c-9f7cae7102d5
          name-label ( RW): USB-ISO
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 7acdd6e8-90ba-8657-2a0a-ffbcca86d405
          name-label ( RW): casaHOS-Qbitorrent
    name-description ( RW): casaHOS-Qbitorrent
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : a8875f36-cfbe-f46e-c59f-88fff7d122c1
          name-label ( RW): XCP-ng Tools
    name-description ( RW): XCP-ng Tools ISOs
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 9551e268-d298-8b69-fc1c-15f466ca2b09
          name-label ( RW): casHOS-JellyFin
    name-description ( RW): casHOS-JellyFin
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : eae7b525-517f-6473-d052-0415c7991752
          name-label ( RW): casaHOS-immich
    name-description ( RW): casaHOS-immich
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : 3ae63e9d-33cd-57ff-759a-f939968f1d69
          name-label ( RW): Removable storage
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): disk


uuid ( RO)                : 27384ca2-a23c-d5c7-a3fc-e2ac755d356c
          name-label ( RW): Main-Pool-XCP
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): ext
        content-type ( RO): user


[00:13 localhost ~]# xe sr-list
uuid ( RO)                : bda59d9a-5655-e903-c569-02c8e1c84465
          name-label ( RW): VM-Pool
    name-description ( RW): 
                host ( RO): <not in database>
                type ( RO): ext
        content-type ( RO): user


uuid ( RO)                : 5ee50bda-201e-633c-ea4c-4ba32b2a0428
          name-label ( RW): casaHOS-NextCloud
    name-description ( RW): casaHOS-NextCloud
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : ae10e37f-237a-d62e-8146-1b9aeeae0562
          name-label ( RW): TrueNAS-ISO
    name-description ( RW): ISOs on trunas
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 405be593-196a-e6c1-1154-737d870ca2c8
          name-label ( RW): DVD drives
    name-description ( RW): Physical DVD drives
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): iso


uuid ( RO)                : d076f279-50f3-906a-f29b-a20822dba819
          name-label ( RW): Local-ISO
    name-description ( RW): 
                host ( RO): <not in database>
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : c360423b-dbc3-833c-a77c-9f7cae7102d5
          name-label ( RW): USB-ISO
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 7acdd6e8-90ba-8657-2a0a-ffbcca86d405
          name-label ( RW): casaHOS-Qbitorrent
    name-description ( RW): casaHOS-Qbitorrent
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : a8875f36-cfbe-f46e-c59f-88fff7d122c1
          name-label ( RW): XCP-ng Tools
    name-description ( RW): XCP-ng Tools ISOs
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 9551e268-d298-8b69-fc1c-15f466ca2b09
          name-label ( RW): casHOS-JellyFin
    name-description ( RW): casHOS-JellyFin
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : eae7b525-517f-6473-d052-0415c7991752
          name-label ( RW): casaHOS-immich
    name-description ( RW): casaHOS-immich
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : 3ae63e9d-33cd-57ff-759a-f939968f1d69
          name-label ( RW): Removable storage
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): disk


uuid ( RO)                : 27384ca2-a23c-d5c7-a3fc-e2ac755d356c
          name-label ( RW): Main-Pool-XCP
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): ext
        content-type ( RO): user


[00:17 localhost ~]# lsblk
NAME                                                                                            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdb                                                                                               8:16   0 465.7G  0 disk 
├─sdb4                                                                                            8:20   0   512M  0 part /boot/efi
├─sdb2                                                                                            8:18   0    18G  0 part 
├─sdb5                                                                                            8:21   0     4G  0 part /var/log
├─sdb3                                                                                            8:19   0 424.2G  0 part 
├─sdb1                                                                                            8:17   0    18G  0 part /
└─sdb6                                                                                            8:22   0     1G  0 part [SWAP]
sdc                                                                                               8:32   1  57.3G  0 disk 
├─sdc2                                                                                            8:34   1    32M  0 part 
└─sdc1                                                                                            8:33   1  57.3G  0 part 
sda                                                                                               8:0    0   7.5T  0 disk 
└─XSLocalEXT--27384ca2--a23c--d5c7--a3fc--e2ac755d356c-27384ca2--a23c--d5c7--a3fc--e2ac755d356c 253:0    0   7.5T  0 lvm  /run/sr-mount/27384ca2-a23c-d5c7-a3fc-e2ac755d356c
[00:20 localhost ~]# mount | grep sr-mount
10.10.10.1:/mnt/Deadpool/cos-appdata/cos-immich/eae7b525-517f-6473-d052-0415c7991752 on /run/sr-mount/eae7b525-517f-6473-d052-0415c7991752 type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,acdirmin=0,acdirmax=0,soft,proto=tcp,timeo=200,retrans=4,sec=sys,clientaddr=10.10.10.2,local_lock=none,addr=10.10.10.1)
/dev/mapper/XSLocalEXT--27384ca2--a23c--d5c7--a3fc--e2ac755d356c-27384ca2--a23c--d5c7--a3fc--e2ac755d356c on /run/sr-mount/27384ca2-a23c-d5c7-a3fc-e2ac755d356c type ext4 (rw,relatime)
10.10.10.1:/mnt/Deadpool/cos-downloads/7acdd6e8-90ba-8657-2a0a-ffbcca86d405 on /run/sr-mount/7acdd6e8-90ba-8657-2a0a-ffbcca86d405 type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,acdirmin=0,acdirmax=0,soft,proto=tcp,timeo=200,retrans=4,sec=sys,clientaddr=10.10.10.2,local_lock=none,addr=10.10.10.1)
10.10.10.1:/mnt/Deadpool/cos-media/9551e268-d298-8b69-fc1c-15f466ca2b09 on /run/sr-mount/9551e268-d298-8b69-fc1c-15f466ca2b09 type nfs (rw,relatime,vers=3,rsize=1048576,wsize=1048576,namlen=255,acdirmin=0,acdirmax=0,soft,proto=tcp,timeo=200,retrans=4,sec=sys,mountaddr=10.10.10.1,mountvers=3,mountport=39057,mountproto=tcp,local_lock=none,addr=10.10.10.1)
10.10.10.1:/mnt/Deadpool/AppShare/ISO-Tank on /run/sr-mount/ae10e37f-237a-d62e-8146-1b9aeeae0562 type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,acdirmin=0,acdirmax=0,soft,proto=tcp,timeo=200,retrans=4,sec=sys,clientaddr=10.10.10.2,local_lock=none,addr=10.10.10.1)
[00:20 localhost ~]# mount | grep bda59d9a || echo "VM-Pool not mounted"
VM-Pool not mounted
[00:24 localhost ~]# xe sr-forget uuid=bda59d9a-5655-e903-c569-02c8e1c84465 --force
[00:24 localhost ~]# xe sr-forget uuid=bda59d9a-5655-e903-c569-02c8e1c84465
The uuid you supplied was invalid.
type: SR
uuid: bda59d9a-5655-e903-c569-02c8e1c84465
[00:24 localhost ~]# lsblk -a
NAME                                                                                            MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
tdg                                                                                             254:6    0   250G  0 disk 
sdb                                                                                               8:16   0 465.7G  0 disk 
├─sdb4                                                                                            8:20   0   512M  0 part /boot/efi
├─sdb2                                                                                            8:18   0    18G  0 part 
├─sdb5                                                                                            8:21   0     4G  0 part /var/log
├─sdb3                                                                                            8:19   0 424.2G  0 part 
├─sdb1                                                                                            8:17   0    18G  0 part /
└─sdb6                                                                                            8:22   0     1G  0 part [SWAP]
tde                                                                                             254:4    0   1.2T  0 disk 
tdc                                                                                             254:2    0   6.4G  1 disk 
tda                                                                                             254:0    0   1.2T  0 disk 
tdh                                                                                             254:7    0   3.1G  1 disk 
sdc                                                                                               8:32   1  57.3G  0 disk 
├─sdc2                                                                                            8:34   1    32M  0 part 
└─sdc1                                                                                            8:33   1  57.3G  0 part 
tdf                                                                                             254:5    0   4.7G  1 disk 
sda                                                                                               8:0    0   7.5T  0 disk 
└─XSLocalEXT--27384ca2--a23c--d5c7--a3fc--e2ac755d356c-27384ca2--a23c--d5c7--a3fc--e2ac755d356c 253:0    0   7.5T  0 lvm  /run/sr-mount/27384ca2-a23c-d5c7-a3fc-e2ac755d356c
tdd                                                                                             254:3    0   900G  0 disk 
tdb                                                                                             254:1    0   500G  0 disk 
[07:48 localhost ~]# xe sr-list
uuid ( RO)                : 5ee50bda-201e-633c-ea4c-4ba32b2a0428
          name-label ( RW): casaHOS-NextCloud
    name-description ( RW): casaHOS-NextCloud
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : ae10e37f-237a-d62e-8146-1b9aeeae0562
          name-label ( RW): TrueNAS-ISO
    name-description ( RW): ISOs on trunas
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 405be593-196a-e6c1-1154-737d870ca2c8
          name-label ( RW): DVD drives
    name-description ( RW): Physical DVD drives
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): iso


uuid ( RO)                : d076f279-50f3-906a-f29b-a20822dba819
          name-label ( RW): Local-ISO
    name-description ( RW): 
                host ( RO): <not in database>
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : c360423b-dbc3-833c-a77c-9f7cae7102d5
          name-label ( RW): USB-ISO
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 7acdd6e8-90ba-8657-2a0a-ffbcca86d405
          name-label ( RW): casaHOS-Qbitorrent
    name-description ( RW): casaHOS-Qbitorrent
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : a8875f36-cfbe-f46e-c59f-88fff7d122c1
          name-label ( RW): XCP-ng Tools
    name-description ( RW): XCP-ng Tools ISOs
                host ( RO): localhost
                type ( RO): iso
        content-type ( RO): iso


uuid ( RO)                : 9551e268-d298-8b69-fc1c-15f466ca2b09
          name-label ( RW): casHOS-JellyFin
    name-description ( RW): casHOS-JellyFin
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : eae7b525-517f-6473-d052-0415c7991752
          name-label ( RW): casaHOS-immich
    name-description ( RW): casaHOS-immich
                host ( RO): localhost
                type ( RO): nfs
        content-type ( RO): user


uuid ( RO)                : 3ae63e9d-33cd-57ff-759a-f939968f1d69
          name-label ( RW): Removable storage
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): udev
        content-type ( RO): disk


uuid ( RO)                : 27384ca2-a23c-d5c7-a3fc-e2ac755d356c
          name-label ( RW): Main-Pool-XCP
    name-description ( RW): 
                host ( RO): localhost
                type ( RO): ext
        content-type ( RO): user


[07:48 localhost ~]#
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