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    VM's going really slow after 3 - 4 weeks

    Scheduled Pinned Locked Moved Solved Compute
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    • GheppyG Offline
      Gheppy @olivierlambert
      last edited by

      @olivierlambert
      so this means that in the last case I have 6 vCPU at 100% loade

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

        How many vCPUs you have assigned to this VM?

        GheppyG 1 Reply Last reply Reply Quote 0
        • GheppyG Offline
          Gheppy @olivierlambert
          last edited by

          @olivierlambert
          Server has 24 core and the VM 20

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

            So (roughly and IIRC), you are using 6,23 vCPUs at 100%.

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            • DanpD Offline
              Danp Pro Support Team @Gheppy
              last edited by

              @Gheppy I was surprised to see a graylog VM using so much CPU, but maybe it's normal. 🤷

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              • GheppyG Offline
                Gheppy
                last edited by

                Yes, it is a VM with a heavily used database.
                At the moment I am trying to convince them to buy an XO license for this server.
                I work for a public service and I have no say when it comes to money.

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                • B Offline
                  Berrick @Danp
                  last edited by Berrick

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

                  @Gheppy I was surprised to see a graylog VM using so much CPU, but maybe it's normal. 🤷

                  Not sure if Gheppy DB is graylog. Mine was and when I searched for an answer as to why the strange CPU utilization came up with the same answer Oliver supplied.

                  I would like to point out, as I didn't earlier, that the graylog cpu utilization in the xentop image I up loaded has been fixed so CPU util is much much less now.

                  However, the CPU utilization of that vm was also at the high levels after a server reboot so dont think its the answer to why all vm's slowly slow down

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

                    What's the hardware behind it by the way?

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                    • GheppyG Offline
                      Gheppy
                      last edited by Gheppy

                      My server is HP DL380 G9, CPU 2 x E5-2620 v3 @ 2.40GHz with 4xSSD and 16xHDD 2.5" and 128Gb RAM.
                      System ( XCP-ng and OS ) is on 4 x SSD RAID 10, DB is on 14 x HDD RAID 10.

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                      • B Offline
                        Berrick @Gheppy
                        last edited by

                        @Gheppy What is free disk space like on this VM?

                        This is what caused the CPU's in our graylog server to go nuts. It had almost run out of free disk space. The only thing I have done was to increase free disk space by clearing out some of the older logs.

                        72b922e6-3c6a-457e-984a-271e5ff95961-image.png

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                        • GheppyG Offline
                          Gheppy
                          last edited by Gheppy

                          There is free space, on real disks I have:

                          • 4 x 400Gb SSD = 800Gb RAID 10, on which I have XCP-ng and the rest of the disk is with the first disk of the VM where is the operating system, which has 350 Gb allocated in which I have 2 partitions with 150 Gb SO and 200 Gb SQL log (for some speed). The occupied space being for SO 65Gb and for SQL log of 120Gb.

                          • 14 x 1200Gb = 8.4Tb RAID 10, on which I have the rest of the database divided on 3 virtual disks of 2Tb with soft RAID in the OS ( which is windows ),the configuration is like this because of the XCP-ng limit of 2Tb per vdisk. The database currently has 3.7 Tb.

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

                            @Gheppy If you run top, how is the dom0 CPU load and how is the swap space? If dom0 is saturated it may need more memory allocated to it.

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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

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                                • 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
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