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    CloudatCost Issues

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    cloudatcost cloud computing
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    • scottalanmillerS
      scottalanmiller @A Former User
      last edited by

      @Aaron-Studer said:

      @scottalanmiller said:

      So far I've only seen the IO issues on the Dev1 instances.

      I wonder why?

      I'm sure the over-commit rate on those is much higher. And the IO needs are higher as there are so many OSes doing things, even when idle, in the same IO space.

      1 Reply Last reply Reply Quote 1
      • DanpD
        Danp
        last edited by

        What is a "good" average? On my Dev1 box, I'm seeing 8.41%. On my Dev3 box, I'm seeing 4.45%.

        scottalanmillerS 1 Reply Last reply Reply Quote 0
        • scottalanmillerS
          scottalanmiller @Danp
          last edited by

          @Danp said:

          What is a "good" average? On my Dev1 box, I'm seeing 8.41%. On my Dev3 box, I'm seeing 4.45%.

          Average "should" approach zero. Definitely way under 1%.

          DashrenderD 1 Reply Last reply Reply Quote 0
          • scottalanmillerS
            scottalanmiller
            last edited by

            For example, the MangoLassi database, which you can imagine is relatively busy, produces only .03% IOWait state average. It almost never spikes above .08% in any ten minute period.

            That's point ZERO three. So 8.41 is 280 times higher!!

            DashrenderD 1 Reply Last reply Reply Quote 0
            • DashrenderD
              Dashrender @scottalanmiller
              last edited by

              @scottalanmiller said:

              For example, the MangoLassi database, which you can imagine is relatively busy, produces only .03% IOWait state average. It almost never spikes above .08% in any ten minute period.

              That's point ZERO three. So 8.41 is 280 times higher!!

              Does this than say that the servers C@C are providing are over provisioned? I understand that they are growing capacity and are working to resolve this.

              scottalanmillerS 1 Reply Last reply Reply Quote 0
              • DashrenderD
                Dashrender @scottalanmiller
                last edited by

                @scottalanmiller said:

                @Danp said:

                What is a "good" average? On my Dev1 box, I'm seeing 8.41%. On my Dev3 box, I'm seeing 4.45%.

                Average "should" approach zero. Definitely way under 1%.

                Assuming this is a VM, and it's working correctly, even if he Host machine is super busy, would you expect to see these numbers be outside their normal range if the host is saturated?

                1 Reply Last reply Reply Quote 0
                • scottalanmillerS
                  scottalanmiller @Dashrender
                  last edited by

                  @Dashrender said:

                  Does this than say that the servers C@C are providing are over provisioned? I understand that they are growing capacity and are working to resolve this.

                  It states this right on their status page. They know that they overprovisioned IO and are adding capacity.

                  DashrenderD 1 Reply Last reply Reply Quote 0
                  • DashrenderD
                    Dashrender @scottalanmiller
                    last edited by

                    @scottalanmiller said:

                    @Dashrender said:

                    Does this than say that the servers C@C are providing are over provisioned? I understand that they are growing capacity and are working to resolve this.

                    It states this right on their status page. They know that they overprovisioned IO and are adding capacity.

                    lol I know that, I was mainly asking the second part of my question, in the assumption that our VM is doing what it should.. why does it show a higher than expected IO load?
                    Is it aware of the other loads around it on the host?

                    scottalanmillerS 1 Reply Last reply Reply Quote 0
                    • scottalanmillerS
                      scottalanmiller @Dashrender
                      last edited by

                      @Dashrender said:

                      lol I know that, I was mainly asking the second part of my question, in the assumption that our VM is doing what it should.. why does it show a higher than expected IO load?
                      Is it aware of the other loads around it on the host?

                      Oh, I see. It doesn't show IO load. It shows IOWait state - the amount of time in which the CPU is stuck just waiting for IO to respond. So we have no idea what the load is, we only know that it can't respond to us.

                      DashrenderD 1 Reply Last reply Reply Quote 0
                      • DashrenderD
                        Dashrender @scottalanmiller
                        last edited by

                        @scottalanmiller said:

                        @Dashrender said:

                        lol I know that, I was mainly asking the second part of my question, in the assumption that our VM is doing what it should.. why does it show a higher than expected IO load?
                        Is it aware of the other loads around it on the host?

                        Oh, I see. It doesn't show IO load. It shows IOWait state - the amount of time in which the CPU is stuck just waiting for IO to respond. So we have no idea what the load is, we only know that it can't respond to us.

                        Aww.. ok great, nice lightbulb moment for me.. Thanks!

                        1 Reply Last reply Reply Quote 0
                        • scottalanmillerS
                          scottalanmiller
                          last edited by

                          If the storage was super slow, like it had a carrier pigeon interface, it would show up as having high IOWait but low load. But with SSDs, we assume they are over loaded.

                          1 Reply Last reply Reply Quote 0
                          • ?
                            A Former User
                            last edited by

                            This post is deleted!
                            1 Reply Last reply Reply Quote 0
                            • ?
                              A Former User
                              last edited by

                              What is a SAR report? How do I get one?

                              scottalanmillerS 1 Reply Last reply Reply Quote 0
                              • scottalanmillerS
                                scottalanmiller @A Former User
                                last edited by

                                @Aaron-Studer said:

                                What is a SAR report? How do I get one?

                                In Linux the command to get it is simply sar.

                                Ta da!

                                1 Reply Last reply Reply Quote 0
                                • scottalanmillerS
                                  scottalanmiller
                                  last edited by

                                  If you are missing the sar utility, it means that you forgot to install the sysstat utilities.

                                  Either...

                                  yum -y install sysstat
                                  

                                  Or...

                                  apt-get install sysstat
                                  

                                  If you are on Ubuntu 14.04.2 LTS they do this ridiculous thing that it doesn't turn on my default. Run sar and it will tell you what to change to enable it. It's just editing one file to change a false to a true.

                                  1 Reply Last reply Reply Quote 0
                                  • ?
                                    A Former User
                                    last edited by

                                    @scottalanmiller I always run CentOS7, per your recommendation 🙂

                                    scottalanmillerS 1 Reply Last reply Reply Quote 1
                                    • scottalanmillerS
                                      scottalanmiller @A Former User
                                      last edited by

                                      @Aaron-Studer said:

                                      @scottalanmiller I always run CentOS7, per your recommendation 🙂

                                      Good man. Just the yum and then it takes care itself. Nothing more to do. Report is blank for the first ten minutes after installing. It gets more useful over time. After an hour or so you'll have really useful data.

                                      1 Reply Last reply Reply Quote 0
                                      • ?
                                        A Former User
                                        last edited by

                                        So what would be a reasonable time frame to fix such a issue?

                                        1 Reply Last reply Reply Quote 0
                                        • DashrenderD
                                          Dashrender
                                          last edited by

                                          Great, I just reset my Dev3 box and tried to connect to the console and it told my my attempt was logged for attempted hacking.. nice!

                                          scottalanmillerS 1 Reply Last reply Reply Quote 0
                                          • scottalanmillerS
                                            scottalanmiller @Dashrender
                                            last edited by

                                            @Dashrender said:

                                            Great, I just reset my Dev3 box and tried to connect to the console and it told my my attempt was logged for attempted hacking.. nice!

                                            What gave you that message? Do you have a screenshot?

                                            DashrenderD 1 Reply Last reply Reply Quote 0
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