Re: op sequence

David Riedl <david.riedl@xxxxxxxxxxx> · Mon, 23 Nov 2015 17:08:43 +0100

    As far as I understand the structur of CEPH the answer is No.

    The CRUSH Algorithm decides when and how data gets written.

    Original research paper about CRUSH:

    http://ceph.com/papers/weil-crush-sc06.pdf

    High level description of the CRUSH map inside CEPH

    http://docs.ceph.com/docs/master/rados/operations/crush-map/

    CEPH architecture overview (including CRUSH)

    http://docs.ceph.com/docs/master/architecture/

    - David

    On 23.11.2015 15:44, louis wrote:

        Hi,
          if I submit read or write io in a sequence from a ceph client,
          will these sequence will be kept in osds side? Thanks

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