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    Ubuntu Systemd Bad Entry

    IT Discussion
    systemd ubuntu vm ext4 smartctl error errors smart corrupted buffer io error on device buffer io dm-0
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    • DustinB3403D
      DustinB3403
      last edited by

      So how can I check to see if whatever caused this issue is still present? I mean if it just happens from time to time, fine.

      But wouldn't it be good to know what caused it?

      scottalanmillerS 1 Reply Last reply Reply Quote 0
      • scottalanmillerS
        scottalanmiller @DustinB3403
        last edited by

        @DustinB3403 said in Ubuntu Systemd Bad Entry:

        But wouldn't it be good to know what caused it?

        That's a common thought and it makes sense, kind of. But computers are ridiculously complex beasts and not all issues are replicable. Gamma radiation, insanely uncommon bugs, memory errors, CPU errors, disk errors and such can all lead to corruption. These things happen. If you want to investigate every possible error ever you can easily spend more than the system is worth and only "guess" at the problem in the end - all for something that is unlikely to ever happen again.

        Think of a windshield and you get a crack in it. You don't remember something hitting your windshield. Do you stop driving and spend months doing forensics trying to determine if it was a rock, bird, bug, bridge debris, glass fragility, bizarre temperature change, etc. that caused it to crack? Would knowing be useful? Not if it doesn't happen again.

        So yes, KNOWING would be great. But FINDING OUT is not. Make sense? The cost required to know isn't worth it unless it becomes a repeating problem.

        1 Reply Last reply Reply Quote 1
        • DustinB3403D
          DustinB3403
          last edited by

          This issue is still occurring and interrupting my backup schedule for my VM's.

          The host appears to be fine. So either I have to build a new VM, or something is wrong with the host.

          Guest0_1464176384224_XenCenterMain_2016-05-25_07-39-38.png

          1 Reply Last reply Reply Quote 0
          • DustinB3403D
            DustinB3403
            last edited by

            So doing to a smartctl on the host it appears that /dev/sdb does have several errors. I'll be replacing this drive today and see if the issue persist.

            The other 3 disks have no smart errors at all.

            1 Reply Last reply Reply Quote 1
            • DustinB3403D
              DustinB3403
              last edited by

              essentially this one disk is in a pre-failed state due to age.

              So performing

              mdadm /dev/md0 --fail /dev/sdb --remove /dev/sdb

              and then replacing this disk I should be in a good state.

              1 Reply Last reply Reply Quote 2
              • DustinB3403D
                DustinB3403
                last edited by

                And the array is resilvering the now replaced disk.

                As an FYI for anyone on software RAID, the drives are organized in a manner that aligns to the SATA connections on the board.

                IE : USB boot device is SDA

                SATA1 (or 0 however it is labeled) = SDB
                SATA2 = SDC
                and so on.

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                • DustinB3403D
                  DustinB3403
                  last edited by

                  Well at least for now, the I/O errors have stopped after I replaced the bad disk in the host array and reverted the VM.

                  I'll keep an eye on it and report back if the issue comes back.

                  1 Reply Last reply Reply Quote 2
                  • DustinB3403D
                    DustinB3403
                    last edited by

                    And these are back.

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

                      Same disk?

                      1 Reply Last reply Reply Quote 0
                      • DustinB3403D
                        DustinB3403
                        last edited by

                        On the guest OS there is only 1 disk (it's presented from the array).

                        I checked the smart stats on each drive and found no issues. MD was also fine.

                        1 Reply Last reply Reply Quote 0
                        • DustinB3403D
                          DustinB3403
                          last edited by

                          0_1464262100485_XenCenterMain_2016-05-26_07-28-08.png

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                          • DustinB3403D
                            DustinB3403
                            last edited by

                            0_1464262144980_XenCenterMain_2016-05-26_07-28-53.png

                            1 Reply Last reply Reply Quote 0
                            • DustinB3403D
                              DustinB3403
                              last edited by

                              Although on a separate note..... this is a shit desktop... that is acting as the hypervisor... so errors really shouldn't surprise me.

                              1 Reply Last reply Reply Quote 0
                              • DustinB3403D
                                DustinB3403
                                last edited by

                                All disks in the host are marked as "Old_age" so there really isn't much that I can do besides assemble something else.

                                Hopefully out of newer equipment.

                                1 Reply Last reply Reply Quote 1
                                • DustinB3403D
                                  DustinB3403
                                  last edited by

                                  Maybe I'm reading this wrong.. Smart overall-health self-assessment is passed on all drives.

                                  So maybe it's just a column saying "it'll fail here"

                                  1 Reply Last reply Reply Quote 0
                                  • DustinB3403D
                                    DustinB3403
                                    last edited by

                                    I'm performing long tests on each of the drives to confirm the information I have is accurate. I'll update in ~90 minutes.

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

                                      You can watch this while you wait....

                                      Youtube Video

                                      DustinB3403D 1 Reply Last reply Reply Quote 0
                                      • DustinB3403D
                                        DustinB3403 @scottalanmiller
                                        last edited by

                                        @scottalanmiller said in Ubuntu Systemd Bad Entry:

                                        You can watch this while you wait....

                                        Youtube Video

                                        hahaha thanks...

                                        You might as well have Rick Rolled me.

                                        scottalanmillerS 1 Reply Last reply Reply Quote 0
                                        • scottalanmillerS
                                          scottalanmiller @DustinB3403
                                          last edited by

                                          @DustinB3403 Rick Rolling the Moldovan way.

                                          1 Reply Last reply Reply Quote 2
                                          • DustinB3403D
                                            DustinB3403
                                            last edited by

                                            I'm curious as to why the VM is showing these issues, but the hypervisor isn't listing any issues at all.

                                            scottalanmillerS 1 Reply Last reply Reply Quote 0
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