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Very slow imaging performance on XCP-NG guest vm

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  • D
    DBCountMan
    last edited by Mar 29, 2023, 2:25 PM

    Not a critical issue as I use XCP-NG to image vms for testing the images. Was just wondering if anyone else has this issue.

    Whenever I deploy an image to a vm, it crawls down to less than 1GB/min with several delays between screen updates. Eventually I see these message appear:
    35e78273-4bcd-4289-9c86-8bf36760ea84-image.png

    The host is a Dell PowerEdge R710. I give the guest 4 cores and 8GB ram. I tried 1 socket, 4 cores and also tried 4 sockets 1 core. The network connection is 1Gbps. I tried imaging the same vm using Acronis True Image which took about 8min. If I deploy an image with FOG on the same vm, the process can take +20min.

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    • S
      Sebastian Roth Moderator
      last edited by Mar 30, 2023, 5:26 AM

      @brakcounty Which version of FOG do you use and even more important, which FOS kernel version is installed?

      Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

      Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

      D 1 Reply Last reply Mar 30, 2023, 2:43 PM Reply Quote 0
      • D
        DBCountMan @Sebastian Roth
        last edited by Mar 30, 2023, 2:43 PM

        @Sebastian-Roth FOG version 1.5.10. Not sure how to find the FOS kernel version. Are you referring to the bzImage kernel version? If so the kernel version I’m on is 5.15.93.

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        • S
          Sebastian Roth Moderator
          last edited by Sebastian Roth Mar 30, 2023, 3:22 PM Mar 30, 2023, 9:21 PM

          @brakcounty said in Very slow imaging performance on XCP-NG guest vm:

          Are you referring to the bzImage kernel version? If so the kernel version I’m on is 5.15.93.

          Yes. Just a hint: You can find out the version of kernel binaries by running file /var/www/html/fog/service/ipxe/bzImage* (or using whatever kernel filename you want to know the version).

          We are planing to bring out a fresh new 6.1.x kernel for testing in the next week. Keep an eye on https://github.com/FOGProject/fos/releases for it to come out.

          No idea if that newer kernel version will solve the described issue but it’s worth a try.

          Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

          Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

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          • S
            Sebastian Roth Moderator
            last edited by Mar 31, 2023, 9:37 AM

            @brakcounty A 6.1.22 test kernel is available on Github. Be aware those kernels are untested so far. I dod not have the time to even do the simplest bootup test.

            Web GUI issue? Please check apache error (debian/ubuntu: /var/log/apache2/error.log, centos/fedora/rhel: /var/log/httpd/error_log) and php-fpm log (/var/log/php*-fpm.log)

            Please support FOG if you like it: https://wiki.fogproject.org/wiki/index.php/Support_FOG

            1 Reply Last reply Reply Quote 0
            • [[undefined-on, S Sebastian Roth, Mar 31, 2023, 9:38 AM]]
            • S Sebastian Roth moved this topic from Hardware Compatibility on Mar 31, 2023, 9:38 AM
            • D
              DBCountMan
              last edited by Mar 31, 2023, 6:43 PM

              @Sebastian-Roth The devel kernel version 6.1.22 didn’t help, BUT, I was using the server’s local storage to store the virtual disk. I mounted an SMB share to the xen server, stored the virtual disk on that, voila, no more errors.

              Conclusion: Nothing to do with FOG. 👍

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              • M
                Milheiro
                last edited by Apr 24, 2023, 1:41 PM

                I had that problem with slow imaging. My images were Zstd level 15, and I changed them to Zstd level 5 and the imaging process increased the speed.
                Maybe some one can confirm this.

                Hope to help.

                D 1 Reply Last reply Apr 26, 2023, 1:48 PM Reply Quote 0
                • D
                  DBCountMan @Milheiro
                  last edited by Apr 26, 2023, 1:48 PM

                  @Milheiro Zstd level is compression level right? That I’m aware of. Makes sense if you increase compression that it would take longer to capture/deploy. What I was experiencing was linux kernel level errors, only when deploying to a virtual disk that resides on the xenserver’s local storage array. I wonder if it is something like Truenas where it performs worse when you let the storage controller handle the array vs a soft-raid controlled by the OS.

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