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# Replace a node in subnet tdb26

Motivation: 
 - replacing dead node onv2n-rm4ad-mgpnn-iiheu-6a76r-crgmo-wxpwt-dqf6y-n7gcf-5po4q-2qe

Calculated potential impact on subnet decentralization if replacing:

- 1 additional node would result in: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 3.2999 to 3.3303 (solution penalty: 30)
- 2 additional nodes would result in: (gets better) the average log2 of Nakamoto Coefficients across all features increases from 3.3303 to 3.3578 (solution penalty: 30)
- 3 additional nodes would result in: equal decentralization across all features (solution penalty: 30)
- 4 additional nodes would result in: equal decentralization across all features (solution penalty: 30)
- 5 additional nodes would result in: (gets worse) the number of different Country actors decreases from 27 to 26 (solution penalty: 30)

Based on the calculated potential impact, not replacing additional nodes to improve optimization.

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 `tdb26-jop6k-aogll-7ltgs-eruif-6kk7m-qpktf-gdiqx-mxtrf-vb5e6-eqe`:
```
  node_provider: 11.00 -> 11.00    (+0%)
    data_center: 13.00 -> 13.00    (+0%)
data_center_owner: 12.00 -> 12.00    (+0%)
             area: 9.00 -> 9.00    (+0%)
          country: 6.00 -> 6.00    (+0%)
```

**Mean Nakamoto comparison:** 10.20 -> 10.20  (+0%)

Overall replacement impact: (gets better) the number of different Country actors increases from 26 to 27

Impact on business rules penalties: 30 -> 30


# Details

Nodes removed:
- `onv2n-rm4ad-mgpnn-iiheu-6a76r-crgmo-wxpwt-dqf6y-n7gcf-5po4q-2qe` [health: dead]

Nodes added:
- `dbpb7-eze6y-jdemh-2zemb-nuwhl-75ia7-xpwbf-26quj-2q4ok-u4ado-tqe` [health: healthy]


```
    node_provider                                                              data_center            data_center_owner                                    area                             country        
    -------------                                                              -----------            -----------------                                    ----                             -------        
    3oqw6-vmpk2-mlwlx-52z5x-e3p7u-fjlcw-yxc34-lf2zq-6ub2f-v63hk-lae       1    ar1               1    Africa Data Centres                             1    Barreiro                    1    AR            1
    4dibr-2alzr-h6kva-bvwn2-yqgsl-o577t-od46o-v275p-a2zov-tcw4f-eae       1    ba1               1    Anonstake                                       1    British Columbia            1    AU       2 -> 1
    4fedi-eu6ue-nd7ts-vnof5-hzg66-hgzl7-liy5n-3otyp-h7ipw-owycg-uae       1    bc1               1    Baltneta                                        1    Brussels Capital            1    BE            1
    4jjya-hlyyc-s766p-fd6gr-d6tvv-vo3ah-j5ptx-i73gw-mwgyd-rw6w2-rae       1    bn1               1    Celeste                                         1    Bucuresti                   1    CA            2
    4r6qy-tljxg-slziw-zoteo-pboxh-vlctz-hkv2d-7zior-u3pxm-mmuxb-cae       1    bo1               1    Cloud9                                          1    CABA                        1    CH            3
    6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe       2    br1               1    CyrusOne                                        1    Cape Town                   1    CR            1
    6sq7t-knkul-fko6h-xzvnf-ktbvr-jhx7r-hapzr-kjlek-whugy-zt6ip-xqe       2    bt1               1    Cyxtera                                         1    Colombo                     1    CZ            2
    7at4h-nhtvt-a4s55-jigss-wr2ha-ysxkn-e6w7x-7ggnm-qd3d5-ry66r-cae       1    bu1               1    DataHouse                                       1    Gauteng                     2    DE       0 -> 1
    7ryes-jnj73-bsyu4-lo6h7-lbxk5-x4ien-lylws-5qwzl-hxd5f-xjh3w-mqe       1    cm1               1    Digital Realty                                  1    Geneva                      1    EE            1
    7uioy-xitfw-yqcko-5gpya-3lpsw-dw7zt-dyyyf-wfqif-jvi76-fdbkg-cqe       1    cr1               1    Equinix                                    1 -> 2    Hesse                  0 -> 1    FR            1
    bvcsg-3od6r-jnydw-eysln-aql7w-td5zn-ay5m6-sibd2-jzojt-anwag-mqe       2    ct2               1    Everyware                                       2    HongKong                    2    GE            1
    cgmhq-c4zja-yov4u-zeyao-64ua5-idlhb-ezcgr-cultv-3vqjs-dhwo7-rqe       1    fr2          0 -> 1    HighDC                                          1    Ljubljana                   1    HK            2
    dhywe-eouw6-hstpj-ahsnw-xnjxq-cmqks-47mrg-nnncb-3sr5d-rac6m-nae       1    ge1               1    INAP                                            1    London                      1    IL            1
    diyay-s4rfq-xnx23-zczwi-nptra-5254n-e4zn6-p7tqe-vqhzr-sd4gd-bqe       1    hk3               1    InfonetDC                                       1    Maribor                     1    IN            2
    efem5-kmwaw-xose7-zzhgg-6bfif-twmcw-csg7a-lmqvn-wrdou-mjwlb-vqe       1    hk4               1    Interhost                                       1    Massachusetts               1    JP            1
    eybf4-6t6bb-unfb2-h2hhn-rrfi2-cd2vs-phksn-jdmbn-i463m-4lzds-vqe       1    hu1               1    KT                                              1    Melbourne              1 -> 0    KR            2
    i3cfo-s2tgu-qe5ym-wk7e6-y7ura-pptgu-kevuf-2feh7-z4enq-5hz4s-mqe       1    jb2               1    Latitude.sh                                     1    Navi Mumbai                 1    LK            1
    i7dto-bgkj2-xo5dx-cyrb7-zkk5y-q46eh-gz6iq-qkgyc-w4qte-scgtb-6ae       1    jb3               1    Leaseweb                                        1    Panvel                      1    LT            1
    ihbuj-erwnc-tkjux-tqtnv-zkoar-uniy2-sk2go-xfpkc-znbb4-seukm-wqe  1 -> 0    kr1               1    M247                                            1    Paris                       1    LV            1
    ivf2y-crxj4-y6ewo-un35q-a7pum-wqmbw-pkepy-d6uew-bfmff-g5yxe-eae       1    ld1               1    Master Internet                                 1    Praha                       1    PL            1
    izmhk-lpjum-uo4oy-lviba-yctpc-arg4b-2ywim-vgoiu-gqaj2-gskmw-2qe       1    lj2               1    MasterDC                                        1    Quebec                      1    PT            1
    kos24-5xact-6aror-uofg2-tnvt6-dq3bk-c2c5z-jtptt-jbqvc-lmegy-qae       1    mb1               1    Megazone Cloud                                  1    Queensland                  1    RO            1
    lq5ra-f4ibl-t7wpy-hennc-m4eb7-tnfxe-eorgd-onpsl-wervo-7chjj-6qe       1    mn2          1 -> 0    NEXTDC                                     2 -> 1    Riga                        1    SG            2
    mme7u-zxs3z-jq3un-fbaly-nllcz-toct2-l2kp3-larrb-gti4r-u2bmo-dae       1    mtl1              1    Nano                                            1    San Jose                    1    SI            2
    nmdd6-rouxw-55leh-wcbkn-kejit-njvje-p4s6e-v64d3-nlbjb-vipul-mae       1    nm1               1    Navegalo                                        1    Seoul                       2    UK            1
    py2kr-ipr2p-ryh66-x3a3v-5ts6u-7rfhf-alkna-ueffh-hz5ox-lt6du-qqe       1    pa1               1    Online                                          1    Singapore                   2    US            3
    qsdw4-ao5ye-6rtq4-y3zhm-icjbj-lutd2-sbejz-4ajqz-pcflr-xrhsg-jae       1    pl2               1    OrionStellar                                    1    South Moravian Region       1    ZA            3
    r3yjn-kthmg-pfgmb-2fngg-5c7d7-t6kqg-wi37r-j7gy6-iee64-kjdja-jae       1    pr1               1    Posita.si                                       1    Tallinn                     1                   
    rbn2y-6vfsb-gv35j-4cyvy-pzbdu-e5aum-jzjg6-5b4n5-vuguf-ycubq-zae       1    rg3               1    Racks Central                                   1    Tbilisi                     1                   
    s5nvr-ipdxf-xg6wd-ofacm-7tl4i-nwjzx-uulum-cugwb-kbpsa-wrsgs-cae       1    sc1               1    Rivram                                          1    Tel Aviv                    1                   
    sixix-2nyqd-t2k2v-vlsyz-dssko-ls4hl-hyij4-y7mdp-ja6cj-nsmpf-yae       1    sg1               1    SyT - Servicios y Telecomunicaciones S.A.       1    Texas                       1                   
    sqhxa-h6ili-qkwup-ohzwn-yofnm-vvnp5-kxdhg-saabw-rvua3-xp325-zqe       1    sg3               1    TRG                                             1    Tokyo                       1                   
    ulyfm-vkxtj-o42dg-e4nam-l4tzf-37wci-ggntw-4ma7y-d267g-ywxi6-iae       1    sl1               1    Telin                                           1    Vilnius                     1                   
    unqqg-no4b2-vbyad-ytik2-t3vly-3e57q-aje2t-sjb5l-bd4ke-chggn-uqe       1    st1               1    Teraco                                          1    Virginia                    1                   
    vegae-c4chr-aetfj-7gzuh-c23sx-u2paz-vmvbn-bcage-pu7lu-mptnn-eqe       1    ta1               1    Xneelo                                          1    Warszawa                    1                   
    wdjjk-blh44-lxm74-ojj43-rvgf4-j5rie-nm6xs-xvnuv-j3ptn-25t4v-6ae       1    tb1               1    Yotta                                           1    Zurich                      2                   
    wdnqm-clqti-im5yf-iapio-avjom-kyppl-xuiza-oaz6z-smmts-52wyg-5ae  0 -> 1    tv1               1    hkcolo                                          1                                                    
    zy4m7-z5mhs-zfkpl-zlsjl-blrbx-mvvmq-5z4zu-mf7eq-hhv7o-ezfro-3ae       1    ty3               1    hkntt                                           1                                                    
                                                                               wa3               1                                                                                                         
                                                                               zh2               2                                                                                                         
```


Business rules check results *before* the membership change:
- node_provider 6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- data_center zh2 controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- data_center_owner Everyware controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.


Business rules check results *after* the membership change:
- node_provider 6nbcy-kprg6-ax3db-kh3cz-7jllk-oceyh-jznhs-riguq-fvk6z-6tsds-rqe controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- data_center zh2 controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.
- data_center_owner Equinix controls 2 of nodes, which is higher than target of 1 for the subnet. Applying penalty of 10.


Forum post link: https://forum.dfinity.org/t/replacing-nodes-in-subnet-tdb26/37668


Replace a node in subnet tdb26