Re: Increasing replica count from 2 to 3

Ravishankar N <ravishankar@xxxxxxxxxx> · Thu, 29 Dec 2016 11:10:54 +0530

    On 12/29/2016 10:46 AM, Jackie Tung
      wrote:

      Thanks very much for the advice.

        Would you mind elaborating on the "no io"
          recommendation?  It's somewhat hard for me to guarantee this
          without a long maintenance window.

        What is the consequence of having IO at point of
          add-brick, and for the heal period afterwards?

    Sorry I wasn't clear. Since you're running  16 distribute legs
    (16x2), a lot of self-heals would be running and there is a chance
    that clients might experience slowness due to the self-heals. Other
    than that it should be fine.

    Thanks,

    Ravi

        On Dec 28, 2016 8:27 PM, "Ravishankar
          N" <ravishankar@xxxxxxxxxx>
          wrote:

                On
                  12/29/2016 07:30 AM, Jackie Tung wrote:

                  Version is 3.8.7 on Ubuntu xenial.

                    On Dec 28, 2016 5:56 PM,
                      "Jackie Tung" <jackie@xxxxxxxx>
                      wrote:

                        If someone has experience to
                          share in this area, i'd be grateful.  I have
                          an existing distributed replicated volume,
                          2x16.

                          We have a third server ready
                            to go.  Redhat docs say just run add brick
                            replica 3, then run rebalance.

                          The rebalance step feels a bit
                            off to me.  Isn't some kind of heal
                            operation in order rather than rebalance?

                          No additional usable space
                            will be introduced, only replica count
                            increase from 2 to 3.

              You don't need to run re-balance for increasing the
              replica count. Heals should automatically be triggered
              when you run 'gluster vol add-brick <volname>
              replica 3 <list of bricks for the 3rd replica>`. It
              is advisable to do this when there is no I/O happening  on
              the volume. You can verify that files are getting
              populated in the newly added bricks post running the
              command. 

              -Ravi

                        Thanks
                        Jackie

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