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CA PM - Min. Number of Data Repository Nodes- 3?

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  • 1.  CA PM - Min. Number of Data Repository Nodes- 3?

    Posted 03-12-2018 01:47 AM

    Hello All,

     

    Is it mandatory to have at least 3 nodes part of the Data repository ? I see the sizing tool does not allow anything less than 3 . I understand there are certain advantages of a 3 node cluster instead of a single node DR but in certain scenarios the resource requirements (CPU, Memory, Disk) for a 3 node cluster are quite enormous and if we decide to go with a single node would there be any issues ?

     

    Are there any customers who are running CA PM in a single node or does everyone choose to go with a multi node cluster for DR?

     

    Please let me know your thoughts 



  • 2.  Re: CA PM - Min. Number of Data Repository Nodes- 3?
    Best Answer

    Posted 03-12-2018 03:13 AM

    Hi Phani,

    all the time we have had customers running with single node DR/Vertica system, especially in smaller scale environments as described here Install a Low-Scale System - CA Performance Management - 3.5 - CA Technologies Documentation  

    The sizer reflects this option as well when scaling e.g. a system with less than 150.000 polled items ( e.g. 3.500 devices).

    For larger environments we recommend 3 node (or even more) clusters, which not only tolerate single node failures but also provide distribution of query load.

    Hth,

    Lutz.



  • 3.  Re: CA PM - Min. Number of Data Repository Nodes- 3?

    Posted 03-12-2018 07:20 PM

    Hi Lutz,

     

    Thanks for your comments, the number we are looking for is way above 3500 device limit so may be we should consider a 3 node cluster . I agree there are surely advantages of having a 3 node cluster for a large environment, but resource requirements provided by the sizing tool looks enormous when considering the CPU, Memory and Disk ( data+backup) compared to what we have been using for eHealth. 

    Anyways we will consider our resource availability and make a choice 

     

    Thanks, Phani



  • 4.  Re: CA PM - Min. Number of Data Repository Nodes- 3?

    Posted 03-15-2018 10:21 AM

    Hi Phani,

     

    Just wanted to see if you had any other questions regarding the Vertica configuration after Lutz's response.  As for the sizing in comparison to eHealth there is definitely a substantial difference when considering the DR component in particular.  It is this sort of requirement that allows the k-safe functionality and adds the extra redundancy that keeps you up and running if a node goes down.

     

    Troy