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    blktap module needed for kernel 4.16. kernel 4.16 needed for latest Ceph with bluestore backend.

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    • R Offline
      r1 XCP-ng Team
      last edited by

      Sure. Its not a need as well. I know Citrix tried it years ago but probably left for same reason.

      I'll continue to work on DKMS.

      Cheers. Enjoy the Sunday!

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

        You too!

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        • R Offline
          r1 XCP-ng Team
          last edited by

          Update -

          1. Success in running kernel-4.16+ in dom0 with blktap2 driver + Ceph luminous version with bluestore backend.
          2. Could isolate blktap2 driver from kernel to a loadable kernel module in form of blktap2-4.16.8-modules-1.0-1.x86_64.rpm
          3. Can install any upstream kernel in dom0 but blktap2 needs to be built against same kernel else xapi won't start.

          [root@client ~]# uname -a Linux client.enlight 4.16.13 #1 SMP Wed May 30 09:22:58 GMT 2018 x86_64 x86_64 x86_64 GNU/Linux

          [root@client ~]# rpm -ivh blktap2-4.16.8-modules-1.0-1.x86_64.rpm
          error: Failed dependencies: kernel-uname-r = 4.16.8 is needed by blktap2-4.16.8-modules-1.0-1.x86_64

          So essentially to make it worth - the only option is to setup a continous build system that will build latest stable kernels and host either full upstream dom0 compatible kernel or just the blktap2 module... may be both 🙂

          Time to rest blktap2 and move to the actual Ceph productivity integrations.

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

            We want to make this CI stuff, that we will be the goal of Sam, our new recruit coming in 20 days!

            edit: @r1 you are obviously more than welcome aboard to help us on that!

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            • R Offline
              r1 XCP-ng Team
              last edited by

              @olivierlambert Would you want to include this in that CI? May be on an experimental branch.

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

                I don't know yet, it's likely we'll have multiple CI, one for "stable", one for "experimental" with a lot of fun stuff inside 🙂

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                • R Offline
                  r1 XCP-ng Team
                  last edited by

                  Cool 😄

                  I'll get the patch added to GitHub for open access till then.

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                  • R Offline
                    r1 XCP-ng Team
                    last edited by r1

                    I added the patch on Github - I'm testing it in various systems.

                    If you are using RBDSR then use the extra flag device-config:rbd-mode=kernel while creating the PBD.

                    Cheers.

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

                      Thanks!

                      Is there a way to get this upstream?

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                      • R Offline
                        r1 XCP-ng Team
                        last edited by

                        I don't know yet.
                        I will try for centos-release-xen as its a SIG and maintains Xen specific dom0 kernel.

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

                          The CentOS packaging of Xen is very different from XenServer/XCP-ng. "Upstream" for me meant XenServer, no CentOS (at least for a bit)

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                          • M Offline
                            maxcuttins
                            last edited by

                            @r1 Sorry Rushy,

                            Why did you create a patch instead of directly sent a pull request to the original blktap2 driver.
                            I'll say it's time to stop to make unofficial patches which can be overwritten by upstream updates.
                            Let's change the upstream directly.

                            https://github.com/xapi-project/blktap

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                            • R Offline
                              r1 XCP-ng Team
                              last edited by

                              @maxcuttins There are two packages. User level blktap driver that you referred blktap and a builtin kernel driver blktap2. Said patch is against mainline kernel as additional driver.

                              You still need to have user land blktap from https://github.com/xapi-project/blktap
                              There are instructions lying around https://xcp-ng.org/forum/topic/122/how-to-build-blktap-from-sources/ to build user land blktap (its without patch).

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