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Former Member

nameserver config role maximum number

Hi All,

I have a doubt, I have seen that maximum number of nameserver configured as master as three. My doubt is that what if we have more than three?

Is it not supported or is it not a best practise?

SAP Certified Technology Associate: SAP HANA - by the SAP HANA Academy

Message was edited by: Tom Flanagan

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 02, 2014 at 08:06 PM

    This is what the documentation says,

    Nameserver Role (Configured)

    Specifies the host's configured role as name server

    The following roles are possible:●

    MASTER 1, MASTER 2, MASTER 3

    When you install a distributed system, up to three hosts are automatically configured as master name servers. The configured namesever role of these hosts is MASTER 1, MASTER 2, and MASTER 3.●

    SLAVE

    Additional hosts in your system are configured as slave name servers. The configured nameserver role of these hosts is SLAVE.

    Nameserver Role (Actual)

    Specifies the host's actual role as name server

    The following roles are possible:●

    MASTER

    During system start-up, one of the hosts configured as master name servers (that is, those hosts with configured name server role MASTER 1, MASTER 2, or MASTER 3) is designated to be the active master name server. The actual nameserver role of this host is MASTER. This master name server assigns one volume to each starting index server (those with actual role MASTER or SLAVE), or no volume if it is a standby host (actual indexserver role STANDBY).

    If this active master nameserver host fails, one of the remaining hosts configured as a master name server becomes the active master name server.●

    SLAVE

    The actual nameserver role of the remaining hosts configured as master and slave hosts is SLAVE.

    But it doesnt say whether it is mandatory or not?

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  • Posted on Dec 02, 2014 at 08:14 PM

    Hi,

    Name Server:

    Up to 3 hosts can be configured as MASTER Name Servers (using a “MASTER 1, MASTER 2, MASTER 3” naming designation), while others have to be configured as “SLAVE”. However, in steady state, only one of the “MASTER n” configured hosts has its actual Name Server role as “MASTER” while all other hosts have their actual Name Server roles as “SLAVE”. The MASTER Name Server is responsible for assigning storage/data volumes to active Index Servers at the time they start up.

    If the MASTER Name Server host fails, one of the remaining hosts configured as a “MASTER n” Name Server becomes the active MASTER Name Server.

    .

    Its possible more than three but not good practice

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 03, 2014 at 06:53 AM


    Hi,

    can you please tell me in whic situation you have encoutnthe above configuration ?

    i mean

    why three/more than three ameservers are required ?

    I just wnated t understand it.

    Regards,

    Pavan Gunda

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  • Posted on Dec 04, 2014 at 12:04 PM

    Hi ,

    Three Name Server is sap recommended, you can find this from HANA certification documents too.

    Regards,

    V Srinivasan

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