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    Xen Orchestra and Continuous Replication

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    xen orchestra continuous replication
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    • olivierO
      olivier @DustinB3403
      last edited by

      @DustinB3403 Just create a test VM and start to use it. And play with it 🙂

      DustinB3403D 1 Reply Last reply Reply Quote 0
      • DustinB3403D
        DustinB3403 @olivier
        last edited by

        @olivier said in Xen Orchestra and Continuous Replication:

        @DustinB3403 Just create a test VM and start to use it. And play with it 🙂

        you know... if I weren't tired I might have thought of that..

        1 Reply Last reply Reply Quote 0
        • FATeknollogeeF
          FATeknollogee @olivier
          last edited by

          @olivier said in Xen Orchestra and Continuous Replication:

          @Dashrender Speed of backup is not related to XO. Believe me, if we could done something about that, we would do it. But there is improvements on XS7 and a new patch coming will also double or triple perfs (at least).

          A new patch from you (XO) or from Citrix/Xen?

          olivierO BRRABillB 2 Replies Last reply Reply Quote 0
          • olivierO
            olivier @FATeknollogee
            last edited by

            @FATeknollogee Citrix. Backup speed is not XO dependent.

            1 Reply Last reply Reply Quote 0
            • KellyK
              Kelly @Dashrender
              last edited by

              @Dashrender said in Xen Orchestra and Continuous Replication:

              @Kelly said in Xen Orchestra and Continuous Replication:

              I've actually been looking at the commercial version of XO for my primary backup system now that I'm almost 100% XenServer. It looks like decent value for the money.

              Are you using it for backups as well?
              If so, how is the backup performance wise? the last time I tried it was pretty slow. 700 GB took 2+ days, that was before the last major update though, and XS v6.5

              Haven't tried it yet. I'm just reaching the evaluation stage.

              1 Reply Last reply Reply Quote 0
              • BRRABillB
                BRRABill @FATeknollogee
                last edited by BRRABill

                @FATeknollogee said in Xen Orchestra and Continuous Replication:

                @olivier said in Xen Orchestra and Continuous Replication:

                @Dashrender Speed of backup is not related to XO. Believe me, if we could done something about that, we would do it. But there is improvements on XS7 and a new patch coming will also double or triple perfs (at least).

                A new patch from you (XO) or from Citrix/Xen?

                There is a thread here on ML that describes the bug, and the patching process Citrix is working on. You can subscribe to it to follow along with what they are doing. @olivier is a major piece of that.

                1 Reply Last reply Reply Quote 1
                • DashrenderD
                  Dashrender @olivier
                  last edited by

                  @olivier said in Xen Orchestra and Continuous Replication:

                  @Dashrender Speed of backup is not related to XO. Believe me, if we could done something about that, we would do it. But there is improvements on XS7 and a new patch coming will also double or triple perfs (at least).

                  Yeah - I know that it's not XO's fault. Considering how slow backups are on XS, I'm a bit amazed it's used. I say this slightly tongue in cheek.

                  I know there was talk of improvement - was the a placebo before in earlier versions of XS 7?

                  olivierO 1 Reply Last reply Reply Quote 0
                  • olivierO
                    olivier @Dashrender
                    last edited by

                    @Dashrender It's not slow for everyone: I'm maxing a GBit link without any problem and we have some users having larger connections used for backup. Otherwise, we won't have clients.

                    Also, everyone knows (in XS world at least) that having large VMs -in terms of disk space- is not a good idea*, so it's not a common practice (and that's good).

                    • : for a lot of reasons, time to backup, snapshot space, Xen storage motion time, restore time and a LOT of things.
                    FATeknollogeeF 1 Reply Last reply Reply Quote 0
                    • olivierO
                      olivier
                      last edited by

                      To take your example, your 700GB backup should take 4 or 5 hours max, and then delta would be almost done instantly.

                      DustinB3403D 1 Reply Last reply Reply Quote 0
                      • DustinB3403D
                        DustinB3403 @olivier
                        last edited by

                        @olivier So a question for you is with CR, would you also take forever delta's?

                        olivierO 1 Reply Last reply Reply Quote 0
                        • olivierO
                          olivier @DustinB3403
                          last edited by

                          @DustinB3403 This is kind of similar than delta backup, but the merge is done inside XenServer directly. After the first replication (full), it will only send the delta's.

                          1 Reply Last reply Reply Quote 0
                          • FATeknollogeeF
                            FATeknollogee @olivier
                            last edited by

                            @olivier said in Xen Orchestra and Continuous Replication:

                            @Dashrender It's not slow for everyone: I'm maxing a GBit link without any problem and we have some users having larger connections used for backup. Otherwise, we won't have clients.

                            Also, everyone knows (in XS world at least) that having large VMs -in terms of disk space- is not a good idea*, so it's not a common practice (and that's good).

                            • : for a lot of reasons, time to backup, snapshot space, Xen storage motion time, restore time and a LOT of things.

                            How large is too large?

                            DustinB3403D olivierO 2 Replies Last reply Reply Quote 0
                            • DustinB3403D
                              DustinB3403 @FATeknollogee
                              last edited by

                              @FATeknollogee said in Xen Orchestra and Continuous Replication:

                              @olivier said in Xen Orchestra and Continuous Replication:

                              @Dashrender It's not slow for everyone: I'm maxing a GBit link without any problem and we have some users having larger connections used for backup. Otherwise, we won't have clients.

                              Also, everyone knows (in XS world at least) that having large VMs -in terms of disk space- is not a good idea*, so it's not a common practice (and that's good).

                              • : for a lot of reasons, time to backup, snapshot space, Xen storage motion time, restore time and a LOT of things.

                              How large is too large?

                              Hundred's of TB's is the impression I was under.

                              1 Reply Last reply Reply Quote 0
                              • olivierO
                                olivier @FATeknollogee
                                last edited by

                                Hundreds of GBs starts to be harder/less flexible to play with in general. Anyway, the limit is 2TB due to VHD format.

                                I would prefer to use a filer and NFS/SMB to it from VMs. This way you separate your VM issues to your data/file issues.

                                FATeknollogeeF DustinB3403D 2 Replies Last reply Reply Quote 0
                                • FATeknollogeeF
                                  FATeknollogee @olivier
                                  last edited by

                                  @olivier You prefer not to use local storage?

                                  olivierO 1 Reply Last reply Reply Quote 0
                                  • DustinB3403D
                                    DustinB3403 @olivier
                                    last edited by

                                    @olivier yeah that sounds as if you prefer iSCSI data storage on the VM.

                                    This way your VM is a meager 350GB c drive, and the data just hooks in from the back end.

                                    1 Reply Last reply Reply Quote 0
                                    • olivierO
                                      olivier @FATeknollogee
                                      last edited by

                                      @FATeknollogee SR type doesn't matter in this case. I said to NOT attach large disks to VMs but to prefer, inside the VM, to mount a remote data store from a NAS/SAN/whatever.

                                      This way your VM keeps a system disks (let's say 20 or 50GB) and that's all to backup/restore.

                                      DustinB3403D 1 Reply Last reply Reply Quote 1
                                      • DustinB3403D
                                        DustinB3403 @olivier
                                        last edited by

                                        @olivier said in Xen Orchestra and Continuous Replication:

                                        @FATeknollogee SR type doesn't matter in this case. I said to NOT attach large disks to VMs but to prefer, inside the VM, to mount a remote data store from a NAS/SAN/whatever.

                                        This way your VM keeps a system disks (let's say 20 or 50GB) and that's all to backup/restore.

                                        That is how I read it, but it seems backwards to do so generally. Since local will always have a performance boost.

                                        olivierO 1 Reply Last reply Reply Quote 0
                                        • olivierO
                                          olivier @DustinB3403
                                          last edited by

                                          @DustinB3403 You have to put this into context. A fast local SSD disk for a database or webserver is not a bad idea. But that won't need hundreds of GBs.

                                          For a "datastore", there isn't any perf problem to serve larger files on a remote location (when latency isn't an issue)

                                          DustinB3403D 1 Reply Last reply Reply Quote 0
                                          • DustinB3403D
                                            DustinB3403 @olivier
                                            last edited by

                                            @olivier said in Xen Orchestra and Continuous Replication:

                                            @DustinB3403 You have to put this into context. A fast local SSD disk for a database or webserver is not a bad idea. But that won't need hundreds of GBs.

                                            For a "datastore", there isn't any perf problem to serve larger files on a remote location (when latency isn't an issue)

                                            combating latency is the issue though.

                                            😄

                                            olivierO 1 Reply Last reply Reply Quote 0
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