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    XOCE limit ?

    Scheduled Pinned Locked Moved Xen Orchestra
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    • tjkreidlT Offline
      tjkreidl Ambassador @Gheppy
      last edited by

      @Gheppy If you go over a VLAN and/or a priviate, non-routed network, why even introduce the overhead of SSL unless you are super paranoid about security?

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      • GheppyG Offline
        Gheppy @olivierlambert
        last edited by Gheppy

        @olivierlambert
        The only configuration I made for the final test was to pass http:// in front of the IP to connect to XCP-ng servers and the transer is the one shown above.

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        • olivierlambertO Offline
          olivierlambert Vates 🪐 Co-Founder CEO
          last edited by olivierlambert

          Okay so you should try to enable NBD and bench the diff (secure and unsecure). That would be interesting to get a comparison on your side 🙂

          See https://xen-orchestra.com/blog/xen-orchestra-5-76/#🚅-faster-backups-preview for more details

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

            Also, what is your CPU brand/model? Also, how many vCPU do you have in your XO VM?

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            • GheppyG Offline
              Gheppy @olivierlambert
              last edited by Gheppy

              @olivierlambert
              I'll read to see how it's done and I'll start testing with NBD.
              This server has the following configuration, it is only used for backup:

              LENOVO System x3650 M5

              • 64Gb Ram
              • 24x CPU, Xeon CPU E5-2620 v3 @ 2.40GHz
              • 2 x 10Gb LAN, 4 x 1Gb LAN

              XOCE

              • 16x CPU,
              • 12Gb RAM
              • 3 x LAN: 1 x 1Gb, 2 x 10Gb
              tjkreidlT 1 Reply Last reply Reply Quote 0
              • olivierlambertO Offline
                olivierlambert Vates 🪐 Co-Founder CEO
                last edited by

                Okjay so rather old CPU which is relatively inefficient (compared to modern EPYCs) explaining the huge gap in SSL vs plain.

                This is something we can investigate on our side, but if NBD provides a good boost even in SSL, I'm very interested 🙂

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                • tjkreidlT Offline
                  tjkreidl Ambassador @Gheppy
                  last edited by

                  @Gheppy Run "top" ans well as "iostat" during your backup to see if any saturation is taking place -- CPU or memory on dom0, queue and I/O throughput on the storage. I agree with @olivierlambert that a 2.4 GHz CPU is marginal in this day and age.

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                  • olivierlambertO Offline
                    olivierlambert Vates 🪐 Co-Founder CEO
                    last edited by olivierlambert

                    Yes, but I'd like to be more precise: it's not an "excuse" or asking you to purchase better hardware. Just a fact: there's a bottleneck in SSL decode when doing disk export/import in XO. The gap is wider on less efficient CPUs, but also (a bit less) visible on modern ones.

                    I'd like to see if we can "workaround" this by using NBD in SSL, since in the future, nothing will be left in plain but full SSL.

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

                      @olivierlambert

                      I don't understand the following.

                      • After I set/configure NBD on server 2 on LAN 2 of 10Gb (I have 4x1Gb and 2x10Gb LAN)
                      • Then I set/configure NBD on server 3 on LAN 2 of 10Gb (I have 4x1Gb and 2x10Gb LAN)
                      • I connect XOCE on each server on LAN 2

                      This should be ok for an transfer with NBD?

                      What happens with server 1 that does not have a connection with NBD, will do the backup without NBD as it does now?
                      Can I make a backup of a VM with or without NBD and have it stored on the same HDD (as in photo)?
                      The HDD on the NAS is connected as a local iSCSI disk on XCP-ng level, it's not like a normal SR, it's like a /dev/sdX on XCP-ng OS level (to store VHDs on ext4 format to save space).

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

                        I don't remember the code path, if there's a fallback. Adding @florent in the loop

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                        • florentF Offline
                          florent Vates 🪐 XO Team @Gheppy
                          last edited by florent

                          @Gheppy
                          I am not an expert on the network part but I can help on the NBD part

                          We added some info in this PR https://github.com/vatesfr/xen-orchestra/pull/6596, it should be merged in this form or another in master in a few days. It will give the user more info on the NBD usage and the cause (misconfiguration, or network error)

                          Then if XO ( or the proxy) can't connect to the host through the NBD (for example with a network filtering/ routing), it will fall back to the reliable (but non parallelizable) api call

                          Finally , the backup done with NBD or the legacy api call will produce exactly the same data so they are compatibles, but using the same target (as in the same directory , same remote and same VMs) for multiple job can lead to complex support tickets with interesting race conditions.
                          I would advise to only use the same remote/directory only if the backups jobs does not concern the same VMs

                          fbeauchamp opened this pull request in vatesfr/xen-orchestra

                          closed feat(@xen-orchestra/backups): more information on nbd backups #6596

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