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    Xen Orchestra and Continuous Replication

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

                    @DustinB3403 I mean latency of a NAS/SAN for serving files in a "normal" network isn't an issue in general (except for bad designed networks or undersized). For a DB or webserver, latency matters far more (with some order of magnitude)

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

                      I thought all the new cool kids are doing local storage/HCI etc..
                      Now @olivier is saying he prefers a remote mounted datastore!
                      @olivier I thought you were one of the cool kids?

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

                        So @olivier just reading this here.

                        It says

                        1.Create a CR Job
                        2. Manually run the first job
                        3. When completed export the backup Why do we need to export the backup?
                        4. Import it to the destination
                        5. Remove the local copy.

                        I'm planning on performing identical host to host replication. Is that wrong?

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

                          @FATeknollogee I'm not especially vulnerable to trends. I prefer solutions that works and in the same time which are not over complicated.

                          In this case, VMs with larger disks are always more complicated to handle in the end. That's my experience, in the XenServer world.

                          I don't say to never do this or that, that's just in general, you are less exposed by splitting problems into smaller pieces.

                          edit: that's also due to the storage architecture in XenServer. Maybe if it was far better/faster, my advice would be probably different. Having a lot of hope for SMAPIv3

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

                            @DustinB3403 said in Xen Orchestra and Continuous Replication:

                            So @olivier just reading this here.

                            It says

                            1.Create a CR Job
                            2. Manually run the first job
                            3. When completed export the backup Why do we need to export the backup?
                            4. Import it to the destination
                            5. Remove the local copy.

                            I'm planning on performing identical host to host replication. Is that wrong?

                            This is the doc about seeding. Do you need to make an initial seed, really?

                            edit: read the doc carefully, seeding is only a specific case if you need it. I think you read too fast.

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

                              Considering that my new file server resides on a single host, yeah I'm gonna need to pre-seed the target.

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

                                @DustinB3403 I don't see the connection here. Can you explain further? You can't afford to do the initial replication over the network, so you need to export the VM on a disk that you can move over the destination?

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

                                  @olivier said in Xen Orchestra and Continuous Replication:

                                  @DustinB3403 I don't see the connection here. Can you explain further? You can't afford to do the initial replication over the network, so you need to export the VM on a disk that you can move over the destination?

                                  My plan was to go from server to server over the network.

                                  I could push it to my synology that is taking my backups now, and then offload it to the second server, this seems cumbersome though.

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

                                    @DustinB3403 Manual seed is for people who can't afford to do the first replication over the network due to very low bandwidth. Otherwise, don't do it.

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

                                      @olivier said in Xen Orchestra and Continuous Replication:

                                      @DustinB3403 Manual seed is for people who can't afford to do the first replication over the network due to very low bandwidth. Otherwise, don't do it.

                                      What is your definition of very low bandwidth?

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

                                        @DustinB3403 Do you need or not, to transfer the VM content manually with a hard drive disk or by any mean that is not a network copy?

                                        If not, don't even read the manual seed procedure.

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                                        • DustinB3403D
                                          DustinB3403
                                          last edited by

                                          I don't need to manually transfer the content, I just want to hit go, have it take the initial snapshot (I assume it's using snapshots for this) and then seed over.

                                          I wonder how long the initial will take to complete....

                                          DashrenderD olivierO 2 Replies Last reply Reply Quote 0
                                          • DashrenderD
                                            Dashrender @DustinB3403
                                            last edited by

                                            @DustinB3403 said in Xen Orchestra and Continuous Replication:

                                            I don't need to manually transfer the content, I just want to hit go, have it take the initial snapshot (I assume it's using snapshots for this) and then seed over.

                                            I wonder how long the initial will take to complete....

                                            It should take the same no matter what.
                                            Copy to pre-seed location or copy over network to other server.
                                            Both would be the same.

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