Re: Gluster replica over WAN...

Ted Miller <tmiller@xxxxxxxxxxxxxxxxxxx> · Wed, 3 Aug 2016 15:21:06 -0400



    On 8/2/2016 8:14 AM, Gilberto Nunes wrote:

    
          Hello list...
          This is my first post on this list.
          

          I have here two IBM Server, with 9 TB of hardisk on which
            one.
          Between this servers, I have a WAN connecting two
            offices,let say OFFICE1 and OFFICE2.
          This WAN connection is over fibre channel.
          When I setting up gluster with replica with two bricks,
            and mount the gluster volume in other folder, like this:
          

          mount -t glusterfs localhost:/VOLUME /STORAGE
          

          and when I go to that folder, and try to access the content, I
          get a lot of timeout... Even a single ls give a lot of time to
          return the list.
        

        This folder, /STORAGE is access by
          many users, through samba share.
        

        So, when OFFICE1 access the
          gluster server access the files over \\server\share, has a
          long delay to show the files.... Sometimes, get time out.
        

        My question is: is there some way
          to improve the gluster to work faster in this scenario??
        

        Thanks a lot.
        

        Best regards
        

        -- 

        
                                    Gilberto Ferreira

                                      +55 (47) 9676-7530

                                      Skype: gilberto.nunes36

                                    
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    I probably can't help, but I can tell you the kind of things that
    will help people to understand your problem better.

    
    What is the bandwidth between sites?

    
    What is the ping time between sites?

    
    If you run "ping -c10000 <OFFICE2>" from OFFICE1, how many
    pings fail?

    
    What else can you tell us about the WAN connection that would help
    us understand your situation?

    
    How many files are there in the \\server\share directory?

    
    Are people at both sites actively writing files to the shared
    storage?  If not, you may need to look at gluster geo-replication. 
    It is one way, so all writing would have to be done to OFFICE1, with
    OFFICE2 having read-only access.  (Some things that works
    wonderfully for, other things it doesn't work at all.)

    
    I can also tell you that no one who has tried it will endorse
    running a production replica 2 cluster over WAN.  You are asking for
    either downtime or split-brain or both.  Replica 3 is the minimum
    for production use of a replicate cluster, even over LAN.

    
    Ted Miller

    Elkhart, IN, USA

    
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