On Thu, Aug 23, 2018 at 4:11 PM Cody <codeology....@gmail.com> wrote:
> Hi everyone, > > As a newbie, I am grateful for receiving many helps from people on > this mailing list. I would like to quickly test my understanding on > 'step choose|chooseleaf' and wish you could point out any of my > mistakes. > > Suppose I have a following topology: > > root=default > | > datacenter=dc > / | \ > row=a row=b row=c > rack=a1 rack=b1 rack=c1 > host=a1.1 host=b1.1 host=c1.1 > host=a1.2 host=b1.2 host=c1.2 > host=a1.3 host=b1.3 host=c1.3 > rack=a2 rack=b2 rack=c2 > host=a2.1 host=b2.1 host=c2.1 > host=a2.2 host=b2.2 host=c2.2 > host=a2.3 host=b2.3 host=c2.3 > rack=a3 rack=b3 rack=c3 > host=a3.1 host=b3.1 host=c3.1 > host=a3.2 host=b3.2 host=c3.2 > host=a3.3 host=b3.3 host=c3.3 > > *each host has 3 OSDs. > > Then, > > 1) a rule that makes 3 replicas with a row-level failure domain would be > like: > ... > step take default > step chooseleaf fisrtn 0 type row > > 2) a rule that makes 3 replicas in different racks within the same row: > ... > step take default > step choose firstn 1 type row > step chooseleaf firstn 0 type rack > > 3) a rule that makes 3+2 EC with a host-level failure domain: > ... > step take default > step chooseleaf indep 0 type host > > Are the above three rules correct regarding the usage of 'step > choose|chooseleaf'? Yes. > > Thank you! > > Regards, > Cody > > Here are related references from the mailing list: > [1] > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-June/010370.html > [2] > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-August/029255.html > [3] > http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-August/029148.html > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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