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# Replace a node in subnet o3ow2

Motivation: 
 - replacing degraded node 6qxes-2iftw-fq3we-unkdt-y7wnk-4v26t-fftzu-chgeh-t2ljb-qtevx-iae

Calculated impact on subnet decentralization if replacing:

- 1 additional node: equal decentralization across all features

Based on the calculated impact, replacing 0 additional nodes to improve optimization

Note: the heuristic for node replacement relies not only on the Nakamoto coefficient but also on other factors that iteratively optimize network topology.
Due to this, Nakamoto coefficients may not directly increase in every node replacement proposal.
Code for comparing decentralization of two candidate subnet topologies is at:
https://github.com/dfinity/dre/blob/79066127f58c852eaf4adda11610e815a426878c/rs/decentralization/src/nakamoto/mod.rs#L342

NOTE: The information below is provided for your convenience. Please independently verify the decentralization changes rather than relying solely on this summary.
Here is [an explaination of how decentralization is currently calculated](https://dfinity.github.io/dre/decentralization.html), and there are also [instructions for performing what-if analysis](https://dfinity.github.io/dre/subnet-decentralization-whatif.html) if you are wondering if another node would have improved decentralization more.

```
Decentralization Nakamoto coefficient changes for subnet o3ow2-2ipam-6fcjo-3j5vt-fzbge-2g7my-5fz2m-p4o2t-dwlc4-gt2q7-5ae:

    node_provider: 5.00 -> 5.00    (+0%)
      data_center: 5.00 -> 5.00    (+0%)
data_center_owner: 5.00 -> 5.00    (+0%)
             city: 5.00 -> 5.00    (+0%)
          country: 5.00 -> 5.00    (+0%)
        continent: 2.00 -> 2.00    (+0%)

**Mean Nakamoto comparison:** 4.50 -> 4.50  (+0%)

Overall replacement impact: equal decentralization across all features

# Details


Nodes removed:
 --> 6qxes-2iftw-fq3we-unkdt-y7wnk-4v26t-fftzu-chgeh-t2ljb-qtevx-iae [selected based on health: degraded]

Nodes added:
 ++> gn3jh-ppjoz-hdh3g-3dckg-zdgk2-qspnh-5i7p6-dfcq3-ke6vc-n5l7d-sqe [selected based on the number of different NP actors: value changes from 12 to 13]


    node_provider                                                         data_center            data_center_owner                                    city                                  country            continent       
    -------------                                                         -----------            -----------------                                    ----                                  -------            ---------       
    4dibr-2alzr-h6kva-bvwn2-yqgsl-o577t-od46o-v275p-a2zov-tcw4f-eae  1    an1               1    Africa Data Centres                             1    Bucuresti                        1    AR            1    Africa         1
    7at4h-nhtvt-a4s55-jigss-wr2ha-ysxkn-e6w7x-7ggnm-qd3d5-ry66r-cae  1    ar1               1    Cloud9                                          1    CABA                             1    AU            1    Asia           4
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe  1    bu1               1    Cyxtera                                         1    Flanders                         1    BE            1    Europe         4
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae  1    ch2               1    Datacenter United                               1    Gauteng                          1    CA            1    North America  2
    ihbuj-erwnc-tkjux-tqtnv-zkoar-uniy2-sk2go-xfpkc-znbb4-seukm-wqe  1    jb2               1    Digital Realty                             0 -> 1    Illinois                         1    CH       1 -> 0    Oceania        1
    nmdd6-rouxw-55leh-wcbkn-kejit-njvje-p4s6e-v64d3-nlbjb-vipul-mae  1    mb1               1    Equinix                                         1    Maribor                          1    FR       0 -> 1    South America  1
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae  1    mn2               1    Everyware                                  1 -> 0    Melbourne                        1    GE            1                    
    s5nvr-ipdxf-xg6wd-ofacm-7tl4i-nwjzx-uulum-cugwb-kbpsa-wrsgs-cae  1    mr1          0 -> 1    M247                                            1    Navi Mumbai                      1    IN            1                    
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae  1    nm1               1    Megazone Cloud                                  1    Ontario                          1    JP            1                    
    spp3m-vawt7-3gyh6-pjz5d-6zidf-up3qb-yte62-otexv-vfpqg-n6awf-lqe  1    sl1               1    NEXTDC                                          1    Provence-Alpes-Cote d'Azur  0 -> 1    KR            1                    
    ulyfm-vkxtj-o42dg-e4nam-l4tzf-37wci-ggntw-4ma7y-d267g-ywxi6-iae  1    tb1               1    Posita.si                                       1    Seoul                            1    RO            1                    
    vegae-c4chr-aetfj-7gzuh-c23sx-u2paz-vmvbn-bcage-pu7lu-mptnn-eqe  1    to2               1    Rivram                                          1    Tbilisi                          1    SI            1                    
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae  1    ty1               1    SyT - Servicios y Telecomunicaciones S.A.       1    Tokyo                            1    US            1                    
                                                                          zh2          1 -> 0    Tierpoint                                       1    Zurich                      1 -> 0    ZA            1                    


```


Replace a node in subnet o3ow2