Single Server (Replica) Availability Group





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First time caller, long time listener.



I have a situation where I need to stand up a single server Availability Group for around 2 months (i.e. move DBs to a new server, rebuild the current server, and add the rebuilt current server to the AG). Both servers are physical and have roughly the same specs. Windows Server 2016, SQL Server 2014.



My thought was to stand up the AG with the listener now so that when the current server is rebuilt and added to the group, we wouldn't need to add the listener then and update all of our apps/clients (i.e. that would force two migrations, one to the new server, one for the new listener).



I've tested this situation on a few test servers and its working as expected. I also can't foresee a reason not to do this, but I thought it would be worth the community ask since we're talking about Production DBs. My question is has anyone tried this and had any issues? Would anyone recommend against this solution. Thanks.










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    up vote
    6
    down vote

    favorite












    First time caller, long time listener.



    I have a situation where I need to stand up a single server Availability Group for around 2 months (i.e. move DBs to a new server, rebuild the current server, and add the rebuilt current server to the AG). Both servers are physical and have roughly the same specs. Windows Server 2016, SQL Server 2014.



    My thought was to stand up the AG with the listener now so that when the current server is rebuilt and added to the group, we wouldn't need to add the listener then and update all of our apps/clients (i.e. that would force two migrations, one to the new server, one for the new listener).



    I've tested this situation on a few test servers and its working as expected. I also can't foresee a reason not to do this, but I thought it would be worth the community ask since we're talking about Production DBs. My question is has anyone tried this and had any issues? Would anyone recommend against this solution. Thanks.










    share|improve this question







    New contributor




    Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      up vote
      6
      down vote

      favorite









      up vote
      6
      down vote

      favorite











      First time caller, long time listener.



      I have a situation where I need to stand up a single server Availability Group for around 2 months (i.e. move DBs to a new server, rebuild the current server, and add the rebuilt current server to the AG). Both servers are physical and have roughly the same specs. Windows Server 2016, SQL Server 2014.



      My thought was to stand up the AG with the listener now so that when the current server is rebuilt and added to the group, we wouldn't need to add the listener then and update all of our apps/clients (i.e. that would force two migrations, one to the new server, one for the new listener).



      I've tested this situation on a few test servers and its working as expected. I also can't foresee a reason not to do this, but I thought it would be worth the community ask since we're talking about Production DBs. My question is has anyone tried this and had any issues? Would anyone recommend against this solution. Thanks.










      share|improve this question







      New contributor




      Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      First time caller, long time listener.



      I have a situation where I need to stand up a single server Availability Group for around 2 months (i.e. move DBs to a new server, rebuild the current server, and add the rebuilt current server to the AG). Both servers are physical and have roughly the same specs. Windows Server 2016, SQL Server 2014.



      My thought was to stand up the AG with the listener now so that when the current server is rebuilt and added to the group, we wouldn't need to add the listener then and update all of our apps/clients (i.e. that would force two migrations, one to the new server, one for the new listener).



      I've tested this situation on a few test servers and its working as expected. I also can't foresee a reason not to do this, but I thought it would be worth the community ask since we're talking about Production DBs. My question is has anyone tried this and had any issues? Would anyone recommend against this solution. Thanks.







      sql-server availability-groups






      share|improve this question







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      Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









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      share|improve this question






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      asked yesterday









      Select 'DBA'

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      334




      New contributor




      Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      New contributor





      Select 'DBA' is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.






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          1 Answer
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          active

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          up vote
          7
          down vote



          accepted











          First time caller, long time listener.




          Ha! Love it! Welcome :)




          I've tested this situation on a few test servers and its working as expected.




          You are correct, it should work without many if any issues. Since clustering will now be part of the scenario you don't get a free single node lunch... you're still beholden to any cluster or AG level issues that may arise (I'm not saying they will, just that it's now in the issues list).




          My question is has anyone tried this and had any issues?




          I have, in fact, tried this. It does work, the 2-months part does give me a little bit of uneasiness... but assuming the configuration doesn't drift, you should be alright.



          You can also pre-stage a listener by creating a DNS entry with the same name so connection strings don't change, use a network appliance or hardware load balancer, etc. The largest issue is enabling the Always On manager and the service restart required for it, in my opinion. All else (except the listener unless you do the DNS/HLB thing) should or can be transparent.




          Would anyone recommend against this solution.




          I only have the reservations of getting used to the single server performance characteristics and then adding in a synchronous replica or such afterwards. Since the single node AG won't have sync_commit waits and such, you really won't be in for much of a shock... though this could change once the other node is added. Just something to think about.






          share|improve this answer





















          • Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
            – Select 'DBA'
            5 hours ago











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          7
          down vote



          accepted











          First time caller, long time listener.




          Ha! Love it! Welcome :)




          I've tested this situation on a few test servers and its working as expected.




          You are correct, it should work without many if any issues. Since clustering will now be part of the scenario you don't get a free single node lunch... you're still beholden to any cluster or AG level issues that may arise (I'm not saying they will, just that it's now in the issues list).




          My question is has anyone tried this and had any issues?




          I have, in fact, tried this. It does work, the 2-months part does give me a little bit of uneasiness... but assuming the configuration doesn't drift, you should be alright.



          You can also pre-stage a listener by creating a DNS entry with the same name so connection strings don't change, use a network appliance or hardware load balancer, etc. The largest issue is enabling the Always On manager and the service restart required for it, in my opinion. All else (except the listener unless you do the DNS/HLB thing) should or can be transparent.




          Would anyone recommend against this solution.




          I only have the reservations of getting used to the single server performance characteristics and then adding in a synchronous replica or such afterwards. Since the single node AG won't have sync_commit waits and such, you really won't be in for much of a shock... though this could change once the other node is added. Just something to think about.






          share|improve this answer





















          • Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
            – Select 'DBA'
            5 hours ago















          up vote
          7
          down vote



          accepted











          First time caller, long time listener.




          Ha! Love it! Welcome :)




          I've tested this situation on a few test servers and its working as expected.




          You are correct, it should work without many if any issues. Since clustering will now be part of the scenario you don't get a free single node lunch... you're still beholden to any cluster or AG level issues that may arise (I'm not saying they will, just that it's now in the issues list).




          My question is has anyone tried this and had any issues?




          I have, in fact, tried this. It does work, the 2-months part does give me a little bit of uneasiness... but assuming the configuration doesn't drift, you should be alright.



          You can also pre-stage a listener by creating a DNS entry with the same name so connection strings don't change, use a network appliance or hardware load balancer, etc. The largest issue is enabling the Always On manager and the service restart required for it, in my opinion. All else (except the listener unless you do the DNS/HLB thing) should or can be transparent.




          Would anyone recommend against this solution.




          I only have the reservations of getting used to the single server performance characteristics and then adding in a synchronous replica or such afterwards. Since the single node AG won't have sync_commit waits and such, you really won't be in for much of a shock... though this could change once the other node is added. Just something to think about.






          share|improve this answer





















          • Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
            – Select 'DBA'
            5 hours ago













          up vote
          7
          down vote



          accepted







          up vote
          7
          down vote



          accepted







          First time caller, long time listener.




          Ha! Love it! Welcome :)




          I've tested this situation on a few test servers and its working as expected.




          You are correct, it should work without many if any issues. Since clustering will now be part of the scenario you don't get a free single node lunch... you're still beholden to any cluster or AG level issues that may arise (I'm not saying they will, just that it's now in the issues list).




          My question is has anyone tried this and had any issues?




          I have, in fact, tried this. It does work, the 2-months part does give me a little bit of uneasiness... but assuming the configuration doesn't drift, you should be alright.



          You can also pre-stage a listener by creating a DNS entry with the same name so connection strings don't change, use a network appliance or hardware load balancer, etc. The largest issue is enabling the Always On manager and the service restart required for it, in my opinion. All else (except the listener unless you do the DNS/HLB thing) should or can be transparent.




          Would anyone recommend against this solution.




          I only have the reservations of getting used to the single server performance characteristics and then adding in a synchronous replica or such afterwards. Since the single node AG won't have sync_commit waits and such, you really won't be in for much of a shock... though this could change once the other node is added. Just something to think about.






          share|improve this answer













          First time caller, long time listener.




          Ha! Love it! Welcome :)




          I've tested this situation on a few test servers and its working as expected.




          You are correct, it should work without many if any issues. Since clustering will now be part of the scenario you don't get a free single node lunch... you're still beholden to any cluster or AG level issues that may arise (I'm not saying they will, just that it's now in the issues list).




          My question is has anyone tried this and had any issues?




          I have, in fact, tried this. It does work, the 2-months part does give me a little bit of uneasiness... but assuming the configuration doesn't drift, you should be alright.



          You can also pre-stage a listener by creating a DNS entry with the same name so connection strings don't change, use a network appliance or hardware load balancer, etc. The largest issue is enabling the Always On manager and the service restart required for it, in my opinion. All else (except the listener unless you do the DNS/HLB thing) should or can be transparent.




          Would anyone recommend against this solution.




          I only have the reservations of getting used to the single server performance characteristics and then adding in a synchronous replica or such afterwards. Since the single node AG won't have sync_commit waits and such, you really won't be in for much of a shock... though this could change once the other node is added. Just something to think about.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered yesterday









          Sean Gallardy

          14.6k22346




          14.6k22346












          • Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
            – Select 'DBA'
            5 hours ago


















          • Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
            – Select 'DBA'
            5 hours ago
















          Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
          – Select 'DBA'
          5 hours ago




          Sean, thank you for the detailed response. I've been using AGs for a number of years, and this answer touches on many important topics that everyone should consider. The staged DNS alias is a very good idea too.
          – Select 'DBA'
          5 hours ago










          Select 'DBA' is a new contributor. Be nice, and check out our Code of Conduct.










           

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