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    In delta backup force the full backup task in a specific day

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    • robytR Offline
      robyt @florent
      last edited by

      @florent said in In delta backup force the full backup task in a specific day:

      @robyt hi, I tested with up to 16 NBD connection per disk . If the xapi don't accept the connection, it will continue the backup with the open one

      It should be faster, though. What are the latencies between XOA and the host, and XOA and the NAS ?

      Are you using a block based storage ? The merging of such backups may be very expensive either way

      Hi, disk is a single sr?
      Some server has 7(8 sr for a single VM, the nas (a small QNAP) goes under a high load.
      I try to lower NBD to 2 for disk and check the status of nas

      robytR 1 Reply Last reply Reply Quote 0
      • robytR Offline
        robyt @robyt
        last edited by robyt

        @robyt said in In delta backup force the full backup task in a specific day:

        @florent said in In delta backup force the full backup task in a specific day:

        @robyt hi, I tested with up to 16 NBD connection per disk . If the xapi don't accept the connection, it will continue the backup with the open one

        It should be faster, though. What are the latencies between XOA and the host, and XOA and the NAS ?

        Are you using a block based storage ? The merging of such backups may be very expensive either way

        Hi, disk is a single sr?
        Some server has 7(8 sr for a single VM, the nas (a small QNAP) goes under a high load.
        I try to lower NBD to 2 for disk and check the status of nas

        addenda:
        the nas is shared with nfs connection (1 gigabit)
        The transfer is good, but when the transfer ended and start the other operation the load on nas goes over 30 and slow down all transfer

        florentF 1 Reply Last reply Reply Quote 0
        • florentF Offline
          florent Vates 🪐 XO Team @robyt
          last edited by florent

          @robyt I think I misunderstood, you want to decrease the concurrency ?
          the settings is not exposed in the UX or in the config file, but it can be changed in the code if you're ready to test ( if this is an XOA, please open a ticket I will patch for you)

          the file is in <xo server directory>/node_modules/@xen-orchestra/backups/_runners/VmsXapi.mjs and you can put 1 in diskPerVmConcurrency: 0 It will limit the number of disk transferred in parallel per VM

          that way, by limiting VM concurrency, and the disk per vm , you will limit the numbe of thread writing to the NAS

          robytR 1 Reply Last reply Reply Quote 0
          • robytR Offline
            robyt @florent
            last edited by

            @florent said in In delta backup force the full backup task in a specific day:

            @robyt I think I misunderstood, you want to decrease the concurrency ?
            the settings is not exposed in the UX or in the config file, but it can be changed in the code if you're ready to test ( if this is an XOA, please open a ticket I will patch for you)

            the file is in <xo server directory>/node_modules/@xen-orchestra/backups/_runners/VmsXapi.mjs and you can put 1 in diskPerVmConcurrency: 0 It will limit the number of disk transferred in parallel per VM

            that way, by limiting VM concurrency, and the disk per vm , you will limit the numbe of thread writing to the NAS

            Hi, in UI i've "Number of NBD connexion per disk": i've 4 for disk, for last backup i've decreased the value to 1 for 3 backup job and 2 for the big backup job
            at this moment remain only the big, the other was finished
            after the copy to the vm i see a lot of nfs daemon and the load of nas goes high (over 30)
            of course i've a lot of DW nfs daemon in nas

            florentF 1 Reply Last reply Reply Quote 0
            • florentF Offline
              florent Vates 🪐 XO Team @robyt
              last edited by

              @robyt said in In delta backup force the full backup task in a specific day:

              @florent said in In delta backup force the full backup task in a specific day:

              @robyt I think I misunderstood, you want to decrease the concurrency ?
              the settings is not exposed in the UX or in the config file, but it can be changed in the code if you're ready to test ( if this is an XOA, please open a ticket I will patch for you)

              the file is in <xo server directory>/node_modules/@xen-orchestra/backups/_runners/VmsXapi.mjs and you can put 1 in diskPerVmConcurrency: 0 It will limit the number of disk transferred in parallel per VM

              that way, by limiting VM concurrency, and the disk per vm , you will limit the numbe of thread writing to the NAS

              Hi, in UI i've "Number of NBD connexion per disk": i've 4 for disk, for last backup i've decreased the value to 1 for 3 backup job and 2 for the big backup job
              at this moment remain only the big, the other was finished
              after the copy to the vm i see a lot of nfs daemon and the load of nas goes high (over 30)
              of course i've a lot of DW nfs daemon in nas

              after the backup there is the merge process, that will colaesce/merge the older backups. This one is very expensive.
              If your NAS allow it, you can switch the remote to block based storage, in the bottom of the remote settings : "Store backup as multiple data blocks instead of a whole VHD file. (creates 500-1000 files per backed up GB but allows faster merge)"

              Please note that the next backup after enabling/disabling it will be a full for all VM.

              robytR 1 Reply Last reply Reply Quote 0
              • robytR Offline
                robyt @florent
                last edited by olivierlambert

                @florent said in In delta backup force the full backup task in a specific day:

                @robyt said in In delta backup force the full backup task in a specific day:

                @florent said in In delta backup force the full backup task in a specific day:

                @robyt I think I misunderstood, you want to decrease the concurrency ?
                the settings is not exposed in the UX or in the config file, but it can be changed in the code if you're ready to test ( if this is an XOA, please open a ticket I will patch for you)

                the file is in <xo server directory>/node_modules/@xen-orchestra/backups/_runners/VmsXapi.mjs and you can put 1 in diskPerVmConcurrency: 0 It will limit the number of disk transferred in parallel per VM

                that way, by limiting VM concurrency, and the disk per vm , you will limit the numbe of thread writing to the NAS

                Hi, in UI i've "Number of NBD connexion per disk": i've 4 for disk, for last backup i've decreased the value to 1 for 3 backup job and 2 for the big backup job
                at this moment remain only the big, the other was finished
                after the copy to the vm i see a lot of nfs daemon and the load of nas goes high (over 30)
                of course i've a lot of DW nfs daemon in nas

                after the backup there is the merge process, that will colaesce/merge the older backups. This one is very expensive.
                If your NAS allow it, you can switch the remote to block based storage, in the bottom of the remote settings : "Store backup as multiple data blocks instead of a whole VHD file. (creates 500-1000 files per backed up GB but allows faster merge)"

                Please note that the next backup after enabling/disabling it will be a full for all VM.

                Hi, i've tried some months ago but is very very slow
                For the big VM i've over 2 tb of data, may ext4 manage two million files ?

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

                  A quick computation: ext4 by default will be able to handle 4 billion files.

                  Since we store 2MiB blocks, it means up 8 billions MiB stored max. Which is roughly equal to 7PiB worth of data.

                  If you need to store more than this, then you need to go for XFS or ZFS.

                  robytR 2 Replies Last reply Reply Quote 0
                  • robytR Offline
                    robyt @olivierlambert
                    last edited by

                    @olivierlambert said in In delta backup force the full backup task in a specific day:

                    A quick computation: ext4 by default will be able to handle 4 billion files.

                    Since we store 2MiB blocks, it means up 8 billions MiB stored max. Which is roughly equal to 7PiB worth of data.

                    If you need to store more than this, then you need to for XFS or ZFS.

                    ok, i tried with a small VM in separated backup job

                    1 Reply Last reply Reply Quote 0
                    • robytR Offline
                      robyt @olivierlambert
                      last edited by

                      @olivierlambert said in In delta backup force the full backup task in a specific day:

                      A quick computation: ext4 by default will be able to handle 4 billion files.

                      Since we store 2MiB blocks, it means up 8 billions MiB stored max. Which is roughly equal to 7PiB worth of data.

                      If you need to store more than this, then you need to go for XFS or ZFS.

                      it's too slow. 😞
                      I've enable the block mode, i start a backup and the write speed computed by nas is 6/7 mB/sec
                      but if i mount (when the backup process is active) the nas on a linux server and transfer a 1GB block i see 18,3 mB/sec on linux, the nas compute `24 mB/Sec
                      When the linux transfer end the speed go down to 6/7 mB/Sec
                      i'm confused..
                      How i can interrupt the backup process?
                      I need to restart XOA vm?

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

                        Block mode with NBD enabled? That sounds too slow, especially for a first backup (which will be full and won't require any merge)

                        robytR 2 Replies Last reply Reply Quote 0
                        • robytR Offline
                          robyt @olivierlambert
                          last edited by

                          @olivierlambert said in In delta backup force the full backup task in a specific day:

                          Block mode with NBD enabled? That sounds too slow, especially for a first backup (which will be full and won't require any merge)

                          yes, i've tried with and without block mode and nbd is enabled; the network is on NDB nic in pool

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                          • robytR Offline
                            robyt @olivierlambert
                            last edited by

                            @olivierlambert said in In delta backup force the full backup task in a specific day:

                            Block mode with NBD enabled? That sounds too slow, especially for a first backup (which will be full and won't require any merge)

                            0e57de89-11e1-4a42-a34c-162d4151f754-immagine.png
                            is locked to 37%... ho i can stop the backup job without damage old backups?

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