Re: Ceph iSCSI is a prank?

Max Cuttins <max@xxxxxxxxxxxxx> · Fri, 2 Mar 2018 14:25:10 +0100



    Il 02/03/2018 13:27, Federico Lucifredi
      ha scritto:

    
          On Fri, Mar 2, 2018 at 4:29 AM, Max
            Cuttins <max@xxxxxxxxxxxxx>
            wrote:

            
              Hi Federico,

                
                  Hi Max,

                  
                    On Feb 28, 2018, at 10:06 AM, Max Cuttins <max@xxxxxxxxxxxxx>
                    wrote:

                    
                    This is true, but having something that just works
                    in order to have minimum compatibility and start to
                    dismiss old disk is something you should think
                    about.

                    You'll have ages in order to improve and get better
                    performance. But you should allow Users to cut-off
                    old solutions as soon as possible while waiting for
                    a better implementation.

                  
                  I like your thinking, but I wonder why doesn’t a
                  locally-mounted kRBD volume meet this need? It seems
                  easier than iSCSI and I would venture would show twice
                  the performance at least in some cases.

                
              Simple because it's not possible.

              XenServer is closed. You cannot add RPM (so basically
              install ceph) without hack the distribution by removing
              the limitation to YUM.

              And this is what we do here: https://github.com/rposudnevskiy/RBDSR
            

            Understood. Thanks Max, I did not realize you were also
              speaking about Xen, I thought you meant to find an
              arbitrary non-virtual disk  replacement strategy ("start
              to dismiss old disk").
          
        
    I need to find an arbitrary non-virtual disk replacement
    strategy.... compatible with Xen.

    
            We do speak to the Xen team every once in a while, but
              while there is interest in adding Ceph support on their
              side, I think we are somewhat down the list of their
              priorities. 
            

            Thanks -F
          
        
    They are somewhat interested in higher the limitation instead of
    improving their hypervisor.

    Xen 7.3 is exactly Xen 7.2 with new limitations and
    no added features.

    It's a shame.

  
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