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    Testing ZFS with XCP-ng

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    • borzel
      borzel XCP-ng Center Team 🏚️ last edited by

      @eexodus said in Testing ZFS with XCP-ng:

      zpool create -f tank /dev/sda

      If you have 4k disks (aka Advanced Format) use ashift=12

      zpool create -o ashift=12 -f tank /dev/sda

      I would say, for the first testing, please use:

      zfs set sync=disabled tank
zfs set compress=lz4 tank
zfs set atime=off tank

      pool/discs can be live monitored with

      zpool iostat -v 1
      A 1 Reply Last reply Reply Quote 3
      • A
        AllooTikeeChaat @borzel last edited by

        @borzel Not sure if this thread is the right place to ask .. but whats the min and recommended requirements to test ZFS ?

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        • olivierlambert
          olivierlambert Vates 🪐 Admin 🧑‍💻 last edited by

          Well, depends on the level of perfs you want to achieve. A lot of RAM is the key.

          borzel 1 Reply Last reply Reply Quote 0
          • borzel
            borzel XCP-ng Center Team 🏚️ @olivierlambert last edited by

            @olivierlambert said in Testing ZFS with XCP-ng:

            A lot of RAM is the key.

            And if you want more performance, add more RAM 🙂

            1 Reply Last reply Reply Quote 0
            • borzel
              borzel XCP-ng Center Team 🏚️ @stormi last edited by

              @stormi said in Testing ZFS with XCP-ng:

              @borzel It would be nice also to improve https://github.com/xcp-ng/xcp/wiki/ZFS-on-XCP-ng-7.5-and-later because I wrote it and I never used zfs!

              I have no write permissions 😐

              stormi 1 Reply Last reply Reply Quote 0
              • borzel
                borzel XCP-ng Center Team 🏚️ last edited by borzel

                Good ressource with a lot of information, how to really use ZFS, build storages, tuning, etc.: https://www.zfsbuild.com 📰

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                • B
                  buzzzo @borzel last edited by

                  Zfs is a local sr and imho does not add too much advantages vs classic ext sr

                  The real value of zfs is to use built in replication to remote zfs system.
                  Proxmox has built a very interesting solutions around it: async replication of vm on a another node.

                  I know xoa already offer a similar solution but is snapshot based and everyone knows the performance and size problem with this approach.

                  borzel olivierlambert 2 Replies Last reply Reply Quote 0
                  • borzel
                    borzel XCP-ng Center Team 🏚️ @buzzzo last edited by borzel

                    @buzzzo said in Testing ZFS with XCP-ng:

                    Zfs is a local sr and imho does not add too much advantages vs classic ext sr

                    meeeep 🙂

                    • ZFS uses (in standard configuration) half the RAM as read cache
                    • with sync=disabled your writes are faster (but synced to discs every 5 seconds; in one sequential batch - efficient use of slow spinning drives!)
                    • it has checksums from fs-layer down to the device
                    • it's awesome 😉

                    know xoa already offer a similar solution but is snapshot based and everyone knows the performance and size problem with this approach.

                    If we all had 48 hours a day and more people in the team, we could fully integrate ZFS into XCP-ng (with all bells and whistles). But for now we are happy to have the first step done - loose integrate ZFS to start using it and testing stability of the dom0 with ZFS in it.

                    1 Reply Last reply Reply Quote 0
                    • olivierlambert
                      olivierlambert Vates 🪐 Admin 🧑‍💻 @buzzzo last edited by olivierlambert

                      @buzzzo Double meeeep 😆

                      On file level SR (ext, NFS, local ZFS, XOSAN), there is no space issue doing snapshots. Also, perfs are good even with snapshots if you don't have an asthmatic SR.

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                      • B
                        buzzzo @olivierlambert last edited by

                        @olivierlambert meeep!!! ☺

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                        • olivierlambert
                          olivierlambert Vates 🪐 Admin 🧑‍💻 last edited by

                          Meep meep!

                          1 Reply Last reply Reply Quote 1
                          • borzel
                            borzel XCP-ng Center Team 🏚️ last edited by borzel

                            I tested latest and greatest XO (5.24.1 from sources) with latest XCP-ng 7.5 (incl. xcp-ng-extra repo/ZFS). Backups do not work 😞

                            If the VDI is on a ext-SR, all is fine, backup working.
                            If the VDI is on a File-SR (ZFS based), the backup says "VDI_ERROR" or "VDI Chain to long". I will provide logfiles tomorrow if needed.

                            Setup of my File-SR:
                            xe sr-create host-uuid=<xxx> name-label=zfssr type=file other-config:o_direct=false device-config:location=/zfspool/zfssr

                            1 Reply Last reply Reply Quote 0
                            • olivierlambert
                              olivierlambert Vates 🪐 Admin 🧑‍💻 last edited by

                              VDI chain too long doesn't seems related. It means you have a VDI chain that's around 30 files.

                              Can you provide the exact/detailed error log?

                              1 Reply Last reply Reply Quote 0
                              • borzel
                                borzel XCP-ng Center Team 🏚️ last edited by borzel

                                0_1534286419566_560b7fad-965d-42bc-8f40-2eed276163b8-grafik.png

                                1 Reply Last reply Reply Quote 0
                                • borzel
                                  borzel XCP-ng Center Team 🏚️ last edited by borzel

                                  I searched in xensource.log, SMlog and syslog, no related entries found 😞

                                  How can I increase the loglevel of XO?

                                  Here's the log output if I start this job again:

                                  Aug 15 01:10:35 ubuntu xo-server[616]: 2018-08-14T23:10:35.241Z xo:xapi Snapshotting VM pmg as [XO Backup test] pmg
Aug 15 01:10:36 ubuntu xo-server[616]: 2018-08-14T23:10:36.948Z xo:xapi exporting VDI pmg 0
Aug 15 01:10:41 ubuntu xo-server[616]: 2018-08-14T23:10:41.289Z xo:xapi Deleting VM [XO Backup test] pmg
Aug 15 01:10:41 ubuntu xo-server[616]: 2018-08-14T23:10:41.585Z xo:xapi Deleting VDI pmg 0

                                  It's nearly nothing...

                                  1 Reply Last reply Reply Quote 0
                                  • nraynaud
                                    nraynaud XCP-ng Team 🚀 last edited by

                                    @borzel > The error is often in the Settings->Logs panel in XO in this case

                                    borzel 1 Reply Last reply Reply Quote 0
                                    • borzel
                                      borzel XCP-ng Center Team 🏚️ @nraynaud last edited by

                                      @nraynaud no, it's as empty as it could be 😞

                                      1 Reply Last reply Reply Quote 0
                                      • borzel
                                        borzel XCP-ng Center Team 🏚️ last edited by

                                        I found something in /var/log/xensource.log (used tail -f /var/log/xensource.log | grep -i 'error')

                                        Aug 14 23:19:10 hw xapi: [error|hw|63005 INET :::80|[XO] VDI Export R:3001f7e5aa17|vhd_tool_wrapper] vhd-tool failed, returning VDI_IO_ERROR
Aug 14 23:19:10 hw xapi: [error|hw|63005 INET :::80|[XO] VDI Export R:3001f7e5aa17|vhd_tool_wrapper] vhd-tool output: vhd-tool: internal error, uncaught exception:#012          Unix.Unix_error(Unix.EINVAL, "open", "/var/run/sr-mount/9fc67ea3-c9b3-5e62-ecc3-7d1debf81744/6781ab7b-c475-4d72-a7d0-b2aeca2e81e3.vhd")#012          Raised at file "src/core/lwt.ml", line 3008, characters 20-29#012          Called from file "src/unix/lwt_main.ml", line 42, characters 8-18#012          Called from file "src/impl.ml", line 811, characters 4-23#012          Called from file "src/cmdliner_term.ml", line 27, characters 19-24#012          Called from file "src/cmdliner.ml", line 27, characters 27-34#012          Called from file "src/cmdliner.ml", line 106, characters 32-39
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] [XO] VDI Export R:3001f7e5aa17 failed with exception Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] Raised Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 1/13 xapi @ hw Raised at file ocaml/xapi/vhd_tool_wrapper.ml, line 59
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 2/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 3/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 4/13 xapi @ hw Called from file ocaml/xapi/export_raw_vdi.ml, line 47
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 5/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 6/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 7/13 xapi @ hw Called from file ocaml/xapi/export_raw_vdi.ml, line 54
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 8/13 xapi @ hw Called from file ocaml/xapi/export_raw_vdi.ml, line 65
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 9/13 xapi @ hw Called from file ocaml/xapi/server_helpers.ml, line 73
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 10/13 xapi @ hw Called from file ocaml/xapi/server_helpers.ml, line 91
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 11/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 12/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace] 13/13 xapi @ hw Called from file lib/backtrace.ml, line 177
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:315adbf2ec6c|backtrace]
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] VDI.export_raw_vdi D:315adbf2ec6c failed with exception Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] Raised Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 1/13 xapi @ hw Raised at file lib/debug.ml, line 187
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 2/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 3/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 4/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 5/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 6/13 xapi @ hw Called from file ocaml/xapi/xapi_http.ml, line 185
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 7/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 8/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 9/13 xapi @ hw Called from file ocaml/xapi/server_helpers.ml, line 73
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 10/13 xapi @ hw Called from file ocaml/xapi/server_helpers.ml, line 91
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 11/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 22
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 12/13 xapi @ hw Called from file lib/xapi-stdext-pervasives/pervasiveext.ml, line 26
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace] 13/13 xapi @ hw Called from file lib/backtrace.ml, line 177
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80|VDI.export_raw_vdi D:fc8d0f58f1be|backtrace]
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80||backtrace] VDI.export_raw_vdi D:fc8d0f58f1be failed with exception Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80||backtrace] Raised Server_error(VDI_IO_ERROR, [ Device I/O errors ])
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80||backtrace] 1/1 xapi @ hw Raised at file (Thread 63005 has no backtrace table. Was with_backtraces called?, line 0
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80||backtrace]
Aug 14 23:19:11 hw xapi: [error|hw|63005 INET :::80||xapi] Unhandled Api_errors.Server_error(VDI_IO_ERROR, [ Device I/O errors ])
                                        nraynaud 1 Reply Last reply Reply Quote 0
                                        • olivierlambert
                                          olivierlambert Vates 🪐 Admin 🧑‍💻 last edited by

                                          I'll try to run some tests on my side.

                                          1 Reply Last reply Reply Quote 0
                                          • stormi
                                            stormi Vates 🪐 XCP-ng Team 🚀 @borzel last edited by

                                            @borzel I'm not very familiar with github wikis, but I think you can do pull requests against the wiki.

                                            borzel 1 Reply Last reply Reply Quote 0
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