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    Host failure after patches

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    • F Online
      flakpyro @McHenry
      last edited by

      @McHenry No moving the pool master shouldn't result in any config loss.

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      • M Offline
        McHenry @flakpyro
        last edited by

        @flakpyro

        OK, pool is now up and accessible 🙂

        Now I am restoring a VM that resided on the failed master. Fingers crossed.

        Interestingly, the master failed to boot after installing patched. I had also installed the patches on the slave but not yet rebooted the slave. When I elevated the slave to master it said it would reboot in 10 seconds and I thought SHIT what if this fails too.

        I guess the learning here is to only install the patches when the host is ready to be restarted, not before.

        Thanks for the quick response.

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        • M Offline
          McHenry @McHenry
          last edited by

          I maybe spoke to soon.

          The host with my DR VM does not show as being part of the pool
          47e72c3b-f3ca-477c-98ec-12ffc3212bdc-image.png

          Does I need to add it to the new pool master?

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          • M Offline
            McHenry @McHenry
            last edited by

            With a new pool master I am still unable to access the old pool slave as it reports the pool master is unavailable:
            b2daad97-a7e1-4701-9852-788599fae4ea-image.png

            I expect this is because the pool slave is still looking for the old pool master and has not identified that a new pool master exists.

            What needs to be done to the pool slave to have it appear as a member of the pool again?

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            • F Online
              flakpyro @McHenry
              last edited by

              @McHenry did you run

              xe pool-recover-slave
              

              after selecting a new master?

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              • M Offline
                McHenry @flakpyro
                last edited by McHenry

                @flakpyro

                No I didn't. Does this need to be run on the slave itself or the new master?

                When you say "after selecting a new master" do you mean after I did this on the new master?

                xe pool-emergency-transition-to-master
                

                Edit:
                Found this which shows this is run on the new pool master:
                https://www.ervik.as/how-to-change-the-pool-master-in-a-xenserver-farm/

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                • F Online
                  flakpyro @McHenry
                  last edited by

                  @McHenry

                  Yes you'd run that command on the pool master.

                  I linked this earlier in the thread, it outlines the process you need to follow:
                  https://docs.xenserver.com/en-us/xenserver/8/dr/machine-failures.html

                  Let us know if this works!

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                  • M Offline
                    McHenry @flakpyro
                    last edited by

                    @flakpyro

                    Apologies, I missed that. I have run the command and now see:
                    cda41870-c92a-4ff4-a0c5-3359db209d05-image.png

                    hst103 is the new pool master. hst100 is the old pool master that failed.

                    In XO I can only see hst103 under hosts however all three hosts are listed under the pool:
                    c7ec1829-fd07-486e-9280-723544d3a1b3-image.png

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                    • F Online
                      flakpyro @McHenry
                      last edited by

                      @McHenry Have you tried restarting the toolstack on the hosts since running pool-recover-slave?

                      I have only had to do this once before but remember it going fairly smoothly at the time. (As smooth as you can expect a host failure to be anyways)

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                      • M Offline
                        McHenry @flakpyro
                        last edited by McHenry

                        @flakpyro

                        Have restarted the tool stack but no different.

                        When I view hst110 I see:
                        30f512bf-b0e0-4aea-ac57-6912519c401d-image.png

                        I was tempted to restart it however it has Patches pending installation after a restart and as the mater is not fully patched I thought best not to restart it. I understand the master needs to be patched first.

                        I just checked xsconsole on hst110 and it shill shows pool master unavailable
                        8bdfff57-f781-4bfe-b970-685c6e7da261-image.png

                        Do I need to change the pool master used by the slave?
                        d7798915-9ee9-480c-889f-b700f48a7f97-image.png

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                        • F Online
                          flakpyro @McHenry
                          last edited by

                          @McHenry I am wondering if you are in a situation where you need to reboot. You have patches installed but have not rebooted, but have restarted tool stacks on the salves, which means some components have restarted and are running on their new versions? If you have support it may be best to reach out to Vates for guidance.

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                          • M Offline
                            McHenry @flakpyro
                            last edited by

                            @flakpyro

                            Can I restart the slave and install patches if the master has not been patched yet?

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                            • F Online
                              flakpyro @McHenry
                              last edited by

                              @McHenry No the pool master must always been patched and rebooted first. Do you have a pool metadata backup? Are your VMs on shared storage of some sort? In case you need to rebuild the pool.

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                              • M Offline
                                McHenry @flakpyro
                                last edited by

                                @flakpyro

                                My setup is pretty basic.
                                I have two hosts in the pool, one for running VMs on local storage and one for DR backups on local storage.
                                I'd like to setup shared storage so i could run the VMs on multiple hosts and seamlessly move them between hosts without migrating storage too.

                                To setup shared storage would this be on an xcp-ng host or totally independent of xcp-ng?

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                                • M Offline
                                  McHenry @flakpyro
                                  last edited by

                                  @flakpyro

                                  All this complexity makes me question the advantages of having all hosts in the same pool.

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