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fix configuration errors #24

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May 19, 2020
Merged

fix configuration errors #24

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7 changes: 4 additions & 3 deletions ...-CN/3.build-develop-and-administration/3.configurations/0.system-requirement.md
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Expand Up @@ -49,11 +49,12 @@
* 内存：8 GB
* 存储：100 GB, SSD

## 资源估算
## 资源估算（3副本标准配置）

* 存储空间（全集群）：边数量 * 平均边属性的字节数 * 2.5
* 内存（全集群）：边数量 * 4 字节 + RocksDB 实例数量 * (write_buffer_size * max_write_buffer_number + rocksdb_block_cache), 其中 `etc/nebula-storaged.conf` 文件中 `--data_path` 项中的每个目录对应一个 RocksDB 实例
* 存储空间（全集群）：点和边数量 * 平均属性的字节数 * 6
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How did the 6 come from?

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点 * 平均属性的字节数 * 3 + 边 * 平均属性的字节数 * 6 + wal大小？

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Generally, Edge count is much much larger than vertex count & wal. So I simplify the computation.

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As in most cases, how many edges and vertices are only an estimation (e.g., about a 1 Billion). So I think it's not necessary to give a very accurate computation method.

* 内存（全集群）：点边数量 * 5 字节 + RocksDB 实例数量 * (write_buffer_size * max_write_buffer_number + rocksdb_block_cache), 其中 `etc/nebula-storaged.conf` 文件中 `--data_path` 项中的每个目录对应一个 RocksDB 实例
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How did the 5 come from?

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bloomfilter's 2.5 * (inkey + outkey)

* 图空间 partition 数量：全集群硬盘数量 * （2 至 10 —— 硬盘越好该值越大）
* 内存和硬盘另预留 20% buffer。

## 关于机械硬盘和千兆网络

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