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    CloudatCost Issues

    Scheduled Pinned Locked Moved IT Discussion
    cloudatcostcloud computing
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    • ?
      A Former User @thanksajdotcom
      last edited by A Former User

      @thanksajdotcom There was 166 updates, but it did this same thing yesterday, and the updates took less then a minute, both Dev1 boxes. Something is up,

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        scottalanmiller @A Former User
        last edited by

        @Aaron-Studer said:

        Yum -y update took 15 minutes

        That's slow but not crazy. Which OS are you using? It is a big operation with a lot of stuff to download, then to setup in the database, then to roll out one package at a time. Updates really can take a bit of time. Fifteen minutes seems long, but if there is any IO issues, then it would slow down a lot.

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          scottalanmiller @A Former User
          last edited by

          @Aaron-Studer said:

          @thanksajdotcom There was 166 updates, but it did this same thing yesterday, and the updates took less then a minute, both Dev1 boxes. Something is up,

          Could be the IO issues that they list on their site. But it could be more network problems with Rogers, too.

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            scottalanmiller @Danp
            last edited by

            @Danp said:

            I'm also having trouble with my C@C Dev1 box. I'm unable to connect via SSH, Yum install via web console throws errors, etc.

            Did SSH work before? Or is this a new build?

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              scottalanmiller
              last edited by

              Oh you know what, is everyone having login problems using Ubuntu instead of CentOS? I've seen that issue too.

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                scottalanmiller
                last edited by

                I got some huge delays just typing to the console. Like 30 seconds for a line that I was typing to continue.

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                  scottalanmiller
                  last edited by

                  I'm checking the Ubuntu instances and am seeing issues around passwords failures in the auth.log.

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                    scottalanmiller
                    last edited by

                    Looks like you just need to run pwconv after creating a user on Ubuntu 14.04.02. That's all. Works fine once you do that.

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                      scottalanmiller
                      last edited by

                      As I suspected, it's IOWait problems. Always check SAR first for performance problems.

                      Linux 3.13.0-32-generic (ubuntu)        03/09/2015      _x86_64_        (1 CPU)
                      
                      02:05:11 AM     CPU     %user     %nice   %system   %iowait    %steal     %idle
                      02:15:01 AM     all      0.10      0.00      0.31      7.35      0.00     92.24
                      02:25:01 AM     all      0.02      0.00      0.21      5.97      0.00     93.81
                      02:35:01 AM     all      0.00      0.00      0.17      2.01      0.00     97.82
                      02:45:01 AM     all      0.19      0.00      0.28     20.81      0.00     78.73
                      02:55:39 AM     all      1.63      0.00      0.46     28.88      0.00     69.03
                      03:05:01 AM     all      0.22      0.00      0.14      9.61      0.00     90.02
                      03:15:01 AM     all      0.00      0.00      0.12      1.73      0.00     98.15
                      03:25:01 AM     all      0.00      0.00      0.14      7.41      0.00     92.45
                      Average:        all      0.28      0.00      0.23     10.63      0.00     88.86
                      
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                      • ?
                        A Former User
                        last edited by

                        I'm seeing rather large IO delays here too.

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                          scottalanmiller
                          last edited by

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

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                            A Former User @scottalanmiller
                            last edited by

                            @scottalanmiller said:

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

                            I wonder why?

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                              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.

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                                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%.

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                                  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%.

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                                    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!!

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                                      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.

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                                        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?

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                                          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.

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                                            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?

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