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    VM's going really slow after 3 - 4 weeks

    Scheduled Pinned Locked Moved Solved Compute
    36 Posts 9 Posters 6.3k Views 7 Watching
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    • GheppyG Offline
      Gheppy
      last edited by Gheppy

      This is a top img, swap it seems to be ok but memory is 103 Mb free of 7.4Gb.
      I will increase the memory for Xen. Thank you
      a4628398-2b29-4965-ae22-76500a7c151c-image.png

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      • GheppyG Offline
        Gheppy @tjkreidl
        last edited by

        @tjkreidl
        I increased the RAM for Xen to 10Gb and it is much better, maximum 156% on CPU on xentop.
        Thank you

        tjkreidlT 1 Reply Last reply Reply Quote 0
        • tjkreidlT Offline
          tjkreidl Ambassador @Gheppy
          last edited by

          @Gheppy You have to give dom0 enough CPU power for various reaasons: 1) to be able to not be bogged down, itself, 2) to allow VMs to be able to interact with dom0 reasonably fast, 3) to provide enough resources to deal with storage and network I/O. Showing essentially no swap space in use is good!

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          • B Offline
            Berrick @Berrick
            last edited by

            Seasons greetings to all,

            So the slowness of is creeping back. Still cant find any thing obvious
            Latest Xen Top

            4ccf84eb-8d2e-4434-bafc-cd38c43007f2-image.png

            Due to business pressures we have had to reboot the physical server.
            So now have to wait for the issue to re occur.

            there were 5 more patch's which have been applied.

            If anyone has any other suggestion of what to check, specific logs to search etc, etc they would be gratefully received

            Kind regards

            tjkreidlT 1 Reply Last reply Reply Quote 0
            • olivierlambertO Offline
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              Adding @fohdeesha in the loop

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              • Tristis OrisT Offline
                Tristis Oris Top contributor
                last edited by

                can't say that time from reboot a cause of problem, but sometimes i'm feel something about it. Even ssh connection takes tooooo long, like 10 sec in local network. Same for http speed for small services without any load.

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                • tjkreidlT Offline
                  tjkreidl Ambassador @Berrick
                  last edited by

                  @Berrick Run iostat and see if anything shows up as slow or saturated with your storage I/O.

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                  • EddieCh08666741E Offline
                    EddieCh08666741
                    last edited by

                    hi Berrick, most of the issues that happen like this is due to IO i believe. I've been using XCP ng for many years and I have about 100 VMs. I love xcp and its the best out there. There are few instance that my VM starts to crawl to be unusable.

                    1. One of the disk fails in the raid and cause my VMs on that particular server to crawl.
                    2. Too little memory provisioned. Heavy usage.

                    Hope my above helps

                    tjkreidlT 1 Reply Last reply Reply Quote 0
                    • tjkreidlT Offline
                      tjkreidl Ambassador @EddieCh08666741
                      last edited by

                      @EddieCh08666741 Indeed. Run top and make sure you have adequate resources allocated for dom0 for both memory and CPU. There should be no swapping to speak of and the CPU should be nowhere close to 100% in use.

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                      • B Offline
                        Berrick @tjkreidl
                        last edited by

                        Thanks for all the replies.
                        I will be checking when the issue starts again in a few weeks and report back.

                        From previous xentop output I don't believe Dom0 is showing high CPU or Memory.

                        I also dont think there is a problem with the physical disks.

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                        • B Offline
                          Berrick @Berrick
                          last edited by

                          @Berrick
                          So its been a while since my last post on this topic but finally I think we have bottomed this issue out! 🙂

                          So the long and the short.
                          Nothing we tried, checked or diagnostics ran up to this point showed any issue.
                          Then one Monday morning there was one alert from the iLO about "Corrected Memory Error threshold exceeded"

                          As this server was due a memory upgrade to LV memory soon and we would need to reboot to clear the alert we brought the upgrade forward.

                          Since the new memory was installed, tempting fate here, it has been OK

                          Thanks to all that offered advice.

                          Kind regards

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

                            Oh wow. So something was wrong with the hardware, specifically the memory, and potentially more errors and error correction trying to keep up, slowing down everything. Is it a good recap?

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                            • B Offline
                              Berrick @olivierlambert
                              last edited by

                              @olivierlambert said in VM's going really slow after 3 - 4 weeks:

                              Oh wow. So something was wrong with the hardware, specifically the memory, and potentially more errors and error correction trying to keep up, slowing down everything. Is it a good recap?

                              To be honest I am not entirely sure.
                              I tested the memory my self in the early stages of this issue with memtest. In the past memtest has flagged memory issue that HP built in diags hasn't but it ran clean. 😞

                              The server was rebooted prior to replacing the memory out of curiosity and everything came up OK no errors.

                              So we assume that something was wrong with the memory. And now we have are fingers crossed that that is the end if it 🙂

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