Change Details

The `redis_sessions` cluster currently hosts ~2.5GB of data, sharded across 18 servers, per DC which is an overkill. Let's reduce the number of shards to a more sensible number, eg 8. Requirements: * 2 shards per row (if possible) * mediawiki rdb servers in `InitialiseSettings.php` ** mc1030 `C4` ** mc1022 `A6` ** mc1034 `D4` ** mc2030 `C5` ** mc2022 `A8` ** mc2034 `D4` **How?** We will remove one server pair (eqiad-codfw) first, and then the rest of them in one go. **Notes** The following memcached servers should be reimaged: [x] mc2019 [x] mc2021 [x] mc2023 [x] mc2025 [x] mc2027 [] mc2037 [] mc2029 [] mc2031 [] mc2033 [] mc2035 [x] mc1037 [x] mc1038

The `redis_sessions` cluster currently hosts ~2.5GB of data, sharded across 18 servers, per DC which is an overkill. Let's reduce the number of shards to a more sensible number, eg 8. Requirements: * 2 shards per row (if possible) * mediawiki rdb servers in `InitialiseSettings.php` ** mc1030 `C4` ** mc1022 `A6` ** mc1034 `D4` ** mc2030 `C5` ** mc2022 `A8` ** mc2034 `D4` **How?** We will remove one server pair (eqiad-codfw) first, and then the rest of them in one go. **Notes** The following memcached servers should be reimaged: [x] mc2019 [x] mc2021 [x] mc2023 [x] mc2025 [x] mc2027 [χ] mc2037 [] mc2029 [] mc2031 [] mc2033 [] mc2035 [x] mc1037 [x] mc1038

The `redis_sessions` cluster currently hosts ~2.5GB of data, sharded across 18 servers, per DC which is an overkill. Let's reduce the number of shards to a more sensible number, eg 8. Requirements: * 2 shards per row (if possible) * mediawiki rdb servers in `InitialiseSettings.php` ** mc1030 `C4` ** mc1022 `A6` ** mc1034 `D4` ** mc2030 `C5` ** mc2022 `A8` ** mc2034 `D4` **How?** We will remove one server pair (eqiad-codfw) first, and then the rest of them in one go. **Notes** The following memcached servers should be reimaged: [x] mc2019 [x] mc2021 [x] mc2023 [x] mc2025 [x] mc2027 [χ] mc2037 [] mc2029 [] mc2031 [] mc2033 [] mc2035 [x] mc1037 [x] mc1038