Re: Cheers and some thoughts

Joe Julian <joe@xxxxxxxxxxxxxxxx> · Thu, 5 Jan 2017 15:33:28 -0800



    On 01/05/17 11:32, Gandalf
      Corvotempesta wrote:

    
            Il 05 gen 2017 2:00 PM, "Jeff
              Darcy" <jdarcy@xxxxxxxxxx>
              ha scritto:
              There
                used to be an idea called "data classification" to cover
                this

                kind of case.  You're right that setting arbitrary goals
                for arbitrary

                objects would be too difficult.  However, we could have
                multiple pools

                with different replication/EC strategies, then use a
                translator like

                the one for tiering to control which objects go into
                which pools based

                on some kind of policy.  To support that with a
                relatively small

                number of nodes/bricks we'd also need to be able to
                split bricks into

                smaller units, but that's not really all that hard

              
        IMHO one of the biggest drawback in gluster is
          the way it manage bricks
        Adding the ability to add one server per time
          without having to manually rebalance or similiar would be
          usefully
        

        Both ceph and lizard manage this automatically.
        If you want, you can add a single disk to a
          working cluster and automatically the whole cluster is
          rebalanced transparently with no user intervention
        

        This is really usefully an much less error prone
          that having to manually rebalance all the things 
      
      
    That's still not without it's drawbacks, though I'm sure my instance
    is pretty rare. Ceph's automatic migration of data caused a
    cascading failure and a complete loss of 580Tb of data due to a
    hardware bug. If it had been on gluster, none of it would have been
    lost.

  
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