Re: Typical architecture in RDB mode - Number of servers explained ?

Eneko Lacunza <elacunza@xxxxxxxxx> · Thu, 28 Jan 2016 14:32:40 +0100



    Hi,

      
      El 28/01/16 a las 13:53, Gaetan SLONGO escribió:

    
      Dear Ceph users,

        
        We are currently working on CEPH (RBD mode only). The technology
        is currently in "preview" state in our lab. We are currently
        diving into Ceph design... We know it requires at least 3 nodes
        (OSDs+Monitors inside) to work properly. But we would like to
        know if it makes sense to use 4 nodes ? I've heard this is not a
        good idea because all of the capacity of the 4 servers won't be
        available ?

        Someone can confirm ?

      
    There's no problem to use 4 servers for OSD; just don't put a
    monitor in one of the nodes. Always keep an odd number of monitors
    (3 or 5).

    
    Monitors don't need to be in a OSD node, and in fact for medium and
    large clusters it is recommended to have a dedicated node for them.

    
    Cheers

    Eneko

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