XCP-ng
    • Categories
    • Recent
    • Tags
    • Popular
    • Users
    • Groups
    • Register
    • Login

    XO cant Snapshot itself ?

    Scheduled Pinned Locked Moved Solved Xen Orchestra
    35 Posts 7 Posters 3.6k Views 7 Watching
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • olivierlambertO Online
      olivierlambert Vates πŸͺ Co-Founder CEO
      last edited by

      Yes, because on your other VMs, you aren't using a raw VDI πŸ˜‰ RAW doesn't support snapshots, as explained in our doc: https://docs.xcp-ng.org/storage/#using-raw-format

      M 1 Reply Last reply Reply Quote 0
      • M Offline
        Meth0d @olivierlambert
        last edited by

        @olivierlambert Okay but obviously i can create snapshots on the RAW SR (here OPensense in the screenshot above). So this is a should but bould sometiomes does work situation ?-)

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

          Are you sure? It seems you did a snapshot on non-raw VM disk, which is OK. If you do a VM.snapshot, it will individually snapshot ALL the VM disk, including the raw ones. And this is when it breaks.

          I would be very happy to get snapshots on raw drives, but it's not physically possible with SMAPIv1.

          M 1 Reply Last reply Reply Quote 0
          • M Offline
            Meth0d @olivierlambert
            last edited by

            @olivierlambert maybe i missunderstood things, the RAW Disk from my XO VM is the 7TB data disk "[NOBAK] xoa_backup_hdd".
            The system disk is "xoa_sda" is not RAW.

            So i thought excluding the disk with "[NOBAK]" would make me able to snapshot the VM (system disk). So whenever you have attached a RAW device makes you unable to snapshot the VM.

            Detaching it, taking a snapshot and reattaching it would work however?

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

              • On XCP-ng 8.2: [NOBAK] will be only used by Xen Orchestra to NOT export the snapshot generated by VM.snapshot method.
              • On XCP-ng 8.3: [NOBAK] will be used by XO to exclude the disk from the VM.snaphot call during an XO backup (since we added that feature in XAPI ourselves)

              In any case, a manual snapshot will snap all the drives.

              1 Reply Last reply Reply Quote 0
              • M Offline
                Momi_V
                last edited by

                You can do this on the cli (in 8.3) via

                xe vm-snapshot new-name-label=newname uuid=vmUUID ignore-vdi-uuids=uuid1,uuid2,uuid3
                

                It is currently not possible in Xen-Orchestra, see
                https://xcp-ng.org/forum/topic/3607/snapshot-backup-exclude-additional-mounted-disk/8?_=1680267126156

                M 1 Reply Last reply Reply Quote 1
                • M Offline
                  Meth0d @Momi_V
                  last edited by

                  Thanks for the heads up. A [NOSNAP] Feature sounds like a good idea though πŸ™‚

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

                    We have to discuss this internally with @julien-f πŸ™‚

                    julien-fJ 1 Reply Last reply Reply Quote 0
                    • planedropP Offline
                      planedrop Top contributor
                      last edited by

                      FYI just for future things, a generally better way to make greater than 2TiB disks is to simply span them within the guest OS, so basically for 7TiB just make like 4 2TiB VHD's and then have the VM OS span those disks so they appear as a single disk within the VM.

                      I do this all the time, works super well and gives you the ability to still snapshot them, etc....

                      M 1 Reply Last reply Reply Quote 0
                      • M Offline
                        Meth0d @planedrop
                        last edited by

                        @planedrop are you using LVM for that or how are u doing that? I never bothered with the problem because i dont have enough local space for 8TB disk snapshots anyways.

                        planedropP 1 Reply Last reply Reply Quote 0
                        • planedropP Offline
                          planedrop Top contributor @Meth0d
                          last edited by

                          @Meth0d Format wise I am using EXT so it's thin provisioned, and since it's all thin provisioned, snapshots only take up the space of the changes to the disk, so you don't really need enough space for 8TB snapshots.

                          As for LVM, you mean in the VMs to manage spanning? So far I've only really had a need to go beyond 2TiB for Windows VMs so I'm just using NTFS with Windows Disk Manager for those spans. But I imagine you could do it with LVM in Linux, not sure if there are better options for it.

                          1 Reply Last reply Reply Quote 0
                          • julien-fJ Offline
                            julien-f Vates πŸͺ Co-Founder XO Team @olivierlambert
                            last edited by

                            @olivierlambert Does [NOSNAP] implies [NOBAK]?

                            If not, should we ignore [NOSNAP] when a snapshot is required to backup the VM?

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

                              That's a good question and an important choice to make πŸ€”

                              IMHO, the principle of least surprise would tell to ignore [NOSNAP] during a backup. Because I'm afraid people would backup a VM with [NOSNAP] and expect it to be saved. That would be a bad surprise if not. What do you think?

                              julien-fJ 1 Reply Last reply Reply Quote 0
                              • julien-fJ Offline
                                julien-f Vates πŸͺ Co-Founder XO Team @olivierlambert
                                last edited by

                                @olivierlambert I think that [NOSNAP] means that this VDI should not be snapshotted and that ignoring it during backup would be surprising.

                                But your point is valid too, I have no ideal solution, hence my question ^^

                                julien-fJ 1 Reply Last reply Reply Quote 0
                                • julien-fJ Offline
                                  julien-f Vates πŸͺ Co-Founder XO Team @julien-f
                                  last edited by

                                  I don't see a case where one would want [NOSNAP] but not [NOBAK]. Maybe we could require either none or both of them during a backup and not support one without the other?

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

                                    The situation I can have in mind:

                                    • you want your VM to be backup
                                    • when you do a manual snapshot, you don't want to snap a disk

                                    But why doing this? I don't know, it's hard to predict the need for this… At least, if we choose to NOT doing a backup of this disk with NOSNAP, we MUST tell that clearly in the doc.

                                    1 Reply Last reply Reply Quote 0
                                    • W Offline
                                      wilsonqanda
                                      last edited by wilsonqanda

                                      @julien-f @olivierlambert
                                      Was there a resolution on the [NOSNAP] feature just much convenient than going to the CMD each time πŸ™‚ ?

                                      In the meantime will be using snippet below so low priority for me:

                                      xe vm-snapshot new-name-label=newname uuid=vmUUID ignore-vdi-uuids=uuid1,uuid2,uuid3
                                      
                                      1 Reply Last reply Reply Quote 0
                                      • olivierlambertO Online
                                        olivierlambert Vates πŸͺ Co-Founder CEO
                                        last edited by

                                        You mean [NOBAK]?

                                        W 1 Reply Last reply Reply Quote 0
                                        • W Offline
                                          wilsonqanda @olivierlambert
                                          last edited by wilsonqanda

                                          @olivierlambert Thanks for the quick reply. [NOBAK] works for backup by ignoring VDI with [NOBAK] in its name, but when running manual snapshot like stated above the [NOBAK] still show up in the SR meaning it made a copy of the [NOBACK].

                                          Ideally with [NOBAK] it should not take snapshot or backup right or am i understanding it incorrectly? Does this only apply to automated BACKUP & SNAPSHOT only?
                                          94bcd9f6-3051-46f1-91c8-729e4f289d43-image.png

                                          1 Reply Last reply Reply Quote 0
                                          • GheppyG Offline
                                            Gheppy
                                            last edited by Gheppy

                                            From my point of view, it should be with "OR" and if the condition is fulfilled to execute.
                                            E.g :

                                            • if I have "[NOSNAP] 'VM name' " not to execute snapshoot
                                            • if I have "[NOBAK] 'Vm name' " not to execute backup
                                            • if I have "[NOSNAP] [NOBAK] 'Vm name' " not to execute snapshot and backup
                                              But if you make a backup, remove only what is with [NOBAK]
                                            1 Reply Last reply Reply Quote 0
                                            • First post
                                              Last post