Re: Per-client prefered server?

Yannick Perret <yannick.perret@xxxxxxxxxxxxx> · Tue, 8 Mar 2016 10:30:37 +0100



    Le 08/03/2016 10:11, Krutika Dhananjay
      a écrit :

    
          IIUC, you would essentially be unmounting the volume from
            the old building and mounting it near the new building,
            correct?

          
    Well yes.

    
          In that case, you would need to set the
            read-subvolume-index command line option appropriately when
            mounting again.

            The selection of the new read child will not happen
            automatically.

          
    You're right but when mounts are from fstab the volumes may be still
    busy at end of boot-time. There are solutions: update fstab before
    shutdown, mount volumes later, re-reboot after editing…

    But being able to propagate a new local value to client config
    without umount/mount may be usefull.

    
    --

    Y.

    
          HTH,

        
        Krutika

      
        On Fri, Mar 4, 2016 at 5:59 PM, Yannick
          Perret <yannick.perret@xxxxxxxxxxxxx>
          wrote:

          
                Le 04/03/2016 13:12, Krutika Dhananjay a écrit :

                
                    You could configure read-subvolume for
                      individual clients using the following mount
                      option:

                    
                    mount -t glusterfs -o
                      "xlator-option=*replicate*.read-subvolume-index=0"
                      <hostname>:/<volname>
                      <mountpoint>

                    
                    In the example above, 0 represents the zeroth
                      child. If a particular client wants to use the
                      second brick as the read child, use the following:

                    
                    mount -t glusterfs -o
                      "xlator-option=*replicate*.read-subvolume-index=1"
                      <hostname>:/<volname>
                      <mountpoint>
                    

               Thanks for that tip!

              Just a question: as our clients can migrate beetween
              buildings (not often, but it happens), does using
              something like 'mount -o
              "remount,xlator-option=*replicate*.read-subvolume-index=X"
              …' will allow the client to point to the new target
              without stopping volume availability for clients?

              
              --

              Y.

                
                    -Krutika

                    
                    From:

                      "Yannick Perret" <yannick.perret@xxxxxxxxxxxxx>

                      To: "Krutika Dhananjay" <kdhananj@xxxxxxxxxx>

                      Cc: gluster-users@xxxxxxxxxxx

                      Sent: Friday, March 4, 2016 3:35:57 PM

                      Subject: Re:  Per-client
                      prefered server?

                      
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