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YDBDOCS-1577-ADD-NOTE-ABOUT-DC-DENY #28904

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YDBDOCS-1577-ADD-NOTE-ABOUT-DC-DENY
Nov 14, 2025
bc37930
add eng version
Nov 17, 2025
54f4ff5
fix descriprion
Nov 17, 2025
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6 changes: 6 additions & 0 deletions ydb/docs/en/core/concepts/topology.md
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Expand Up @@ -12,6 +12,12 @@ The following {{ ydb-short-name }} distributed storage operating modes are avail

![mirror-3-dc topology](./_assets/mirror-3-dc.drawio.png)

{% note info %}

In the ` mirror-3-dc` operating mode, when leaving the fault model, the data becomes unavailable for both writing and reading.

{% endnote %}

- `block-4-2`. [Erasure coding](https://en.wikipedia.org/wiki/Erasure_code) is applied with two blocks of redundancy added to the four blocks of source data. Storage nodes are placed in at least 8 failure domains (usually racks). {{ ydb-short-name }} cluster remains available if any two domains fail, continuing to record all 6 data parts in the remaining domains. This mode is recommended for clusters deployed within a single availability zone or data center.

![block-4-2 topology](./_assets/block-4-2.drawio.png)
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6 changes: 6 additions & 0 deletions ydb/docs/ru/core/concepts/topology.md
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Expand Up @@ -10,6 +10,12 @@

![топология mirror-3-dc](./_assets/mirror-3-dc.drawio.png)

{% note info %}

В режиме работы `mirror-3-dc` при выходе за пределы модели отказа данные становятся недоступны и на запись, и на чтение.
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@fomichev3000 fomichev3000 Nov 17, 2025

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А почему это замечание про mirror-3-dc? А что, в других топологиях иначе?


{% endnote %}

- `block-4-2`. Избыточность по схеме [стирающего кода](https://ru.wikipedia.org/wiki/Стирающий_код). На каждые 4 блока исходных данных формируются 2 дополнительных блока с кодами избыточности. Узлы хранения размещаются как минимум в 8 доменах отказа (обычно серверных стойках). Кластер {{ ydb-short-name }} остаётся полностью доступным при недоступности двух любых доменов отказа, продолжая записывать все 6 частей данных в оставшихся доменах. Этот режим рекомендуется для кластеров, размещённых в одном дата-центре или зоне доступности.

![топология block-4-2](./_assets/block-4-2.drawio.png)
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