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Advanced Availability

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  • 1.  Advanced Availability

    Posted 02-17-2016 07:05 AM

    Hello Community,

     

    I'm a planning a AA implementation of SDM 14.1. I've read some documentation about it but still have some questions:

     

    How many servers i'll have in total on my Architecture?

    How many servers i'll have with Service Desk on it?

     

    Regards.



  • 2.  Re: Advanced Availability
    Best Answer

    Posted 02-17-2016 08:56 AM

    Hi JasonLLM,

     

    I will explain this in context of using ONLY the Service Desk Manager application and none of the other applications that are a part of the solution.  For Advanced Availability (referred to as "AA") you would need at least 5 servers to really use the AA functionality.  Those would consist of the following:

    1. DB Server for the MDB

    2. Background Server

    3. Standby Server

    4. App server 1

    5. App server 2

     

    You would install Service Desk on the Background, Standby, App1 and App2 servers (so 4 in total).

     

    The Background server takes the place of what was previously the "Primary" server.  It will handle all of the "background transactions" as we call them - things like firing events and notifications, checking for conditions, etc.  The Standby server is just that, its standing by in case something happens to the Background server, in which the Standby server can be "promoted" to be the background server, while work is done on the original Background server.   The end user traffic will ONLY hit the App servers, in which you would want to use something like an F5 load balancer to balance the load between the two (or more) app servers.  The end users do NOT hit the Background or Standby servers.  The only reason you would hit the SDM URL on a background server would be to log into the GUI to configure the standby and app servers via the GUI (as we no longer use pdm_perl pdm_edit like we used to in versions prior to 12.9).

     

    The biggest difference between conventional (Primary/Secondary), and AA (Background, Standby, App servers), is that in a conventional configuration, ONLY the primary server talks to the database, but in an AA environment, each server independently talks to the database and has its own virtdb process and db agents, thus making for better performance in most environments.

     

    I hope this helps give you some insight into using the AA configuration with SDM

     

    Thanks,

    Jon I.



  • 3.  Re: Advanced Availability

    Posted 02-17-2016 09:16 AM

    Hello Jon,

     

    Thanks for the answer. Sorry for not asking at first, if i want to include CABI, how drastic would the changes be?

     

     

    Regards.



  • 4.  Re: Advanced Availability

    Posted 02-17-2016 09:38 AM

    Hi Jason LLM,

    For CABI you would need an additional server, and a database for CABI to use for itself as well.  Depending on how robust the DB server is that you are using for the MDB, you may be able to use that same server for the CABI db as well.  In addition, if you are using CABI for reporting, we always recommend using an offline instance of SDM and the MDB for reporting purposes.  There are instructions to set this up (very specific instructions i should mention - we only support one specific way to set this up), located in the NX_ROOT\samples\reporting directory after you install SDM.

    Hope this helps.

    Thanks,

    Jon I.