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    VM's going really slow after 3 - 4 weeks

    Scheduled Pinned Locked Moved Solved Compute
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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

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

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

          1 Reply Last reply Reply Quote 0
          • 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. 🤷

            B 1 Reply Last reply Reply Quote 0
            • 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.

                          GheppyG 1 Reply Last reply Reply Quote 0
                          • 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.

                                        1 Reply Last reply Reply Quote 1
                                        • 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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