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@@ -38,24 +38,24 @@ Install MinIO - [MinIO Quickstart Guide](https://docs.min.io/docs/minio-quicksta
To start a distributed MinIO instance, you just need to pass drive locations as parameters to the minio server command. Then, you’ll need to run the same command on all the participating nodes.
__NOTE:__
**NOTE:**
- All the nodes running distributed MinIO should share a common root credentials, for the nodes to connect and trust each other. To achieve this, it is __recommended__ to export root user and root password as environment variables, `MINIO_ROOT_USER` and `MINIO_ROOT_PASSWORD`, on all the nodes before executing MinIO server command. If not exported, default `minioadmin/minioadmin` credentials shall be used.
- __MinIO creates erasure-coding sets of *4* to *16* drives per set. The number of drives you provide in total must be a multiple of one of those numbers.__
- __MinIO chooses the largest EC set size which divides into the total number of drives or total number of nodes given - making sure to keep the uniform distribution i.e each node participates equal number of drives per set__.
- __Each object is written to a single EC set, and therefore is spread over no more than 16 drives.__
- __All the nodes running distributed MinIO setup are recommended to be homogeneous, i.e. same operating system, same number of disks and same network interconnects.__
- MinIO distributed mode requires __fresh directories__. If required, the drives can be shared with other applications. You can do this by using a sub-directory exclusive to MinIO. For example, if you have mounted your volume under `/export`, pass `/export/data` as arguments to MinIO server.
- All the nodes running distributed MinIO should share a common root credentials, for the nodes to connect and trust each other. To achieve this, it is **recommended** to export root user and root password as environment variables, `MINIO_ROOT_USER` and `MINIO_ROOT_PASSWORD`, on all the nodes before executing MinIO server command. If not exported, default `minioadmin/minioadmin` credentials shall be used.
- **MinIO creates erasure-coding sets of _4_ to _16_ drives per set. The number of drives you provide in total must be a multiple of one of those numbers.**
- **MinIO chooses the largest EC set size which divides into the total number of drives or total number of nodes given - making sure to keep the uniform distribution i.e each node participates equal number of drives per set**.
- **Each object is written to a single EC set, and therefore is spread over no more than 16 drives.**
- **All the nodes running distributed MinIO setup are recommended to be homogeneous, i.e. same operating system, same number of disks and same network interconnects.**
- MinIO distributed mode requires **fresh directories**. If required, the drives can be shared with other applications. You can do this by using a sub-directory exclusive to MinIO. For example, if you have mounted your volume under `/export`, pass `/export/data` as arguments to MinIO server.
- The IP addresses and drive paths below are for demonstration purposes only, you need to replace these with the actual IP addresses and drive paths/folders.
- Servers running distributed MinIO instances should be less than 15 minutes apart. You can enable [NTP](http://www.ntp.org/) service as a best practice to ensure same times across servers.
- `MINIO_DOMAIN` environment variable should be defined and exported for bucket DNS style support.
- Running Distributed MinIO on __Windows__ operating system is considered **experimental**. Please proceed with caution.
- Running Distributed MinIO on **Windows** operating system is considered **experimental**. Please proceed with caution.
Example 1: Start distributed MinIO instance on n nodes with m drives each mounted at `/export1` to `/exportm` (pictured below), by running this command on all the n nodes:
![Distributed MinIO, n nodes with m drives each](https://github.com/minio/minio/blob/master/docs/screenshots/Architecture-diagram_distributed_nm.png?raw=true)
#### GNU/Linux and macOS
### GNU/Linux and macOS
```sh
export MINIO_ROOT_USER=<ACCESS_KEY>
@@ -63,11 +63,11 @@ export MINIO_ROOT_PASSWORD=<SECRET_KEY>
minio server http://host{1...n}/export{1...m}
```
> __NOTE:__ In above example `n` and `m` represent positive integers, *do not copy paste and expect it work make the changes according to local deployment and setup*.
> **NOTE:** In above example `n` and `m` represent positive integers, _do not copy paste and expect it work make the changes according to local deployment and setup_.
> **NOTE:** `{1...n}` shown have 3 dots! Using only 2 dots `{1..n}` will be interpreted by your shell and won't be passed to MinIO server, affecting the erasure coding order, which would impact performance and high availability. **Always use ellipses syntax `{1...n}` (3 dots!) for optimal erasure-code distribution**
> __NOTE:__ `{1...n}` shown have 3 dots! Using only 2 dots `{1..n}` will be interpreted by your shell and won't be passed to MinIO server, affecting the erasure coding order, which would impact performance and high availability. __Always use ellipses syntax `{1...n}` (3 dots!) for optimal erasure-code distribution__
### Expanding existing distributed setup
#### Expanding existing distributed setup
MinIO supports expanding distributed erasure coded clusters by specifying new set of clusters on the command-line as shown below:
```sh
@@ -77,18 +77,21 @@ minio server http://host{1...n}/export{1...m} http://host{o...z}/export{1...m}
```
For example:
```
minio server http://host{1...4}/export{1...16} http://host{5...12}/export{1...16}
```
Now the server has expanded total storage by _(newly_added_servers\*m)_ more disks, taking the total count to _(existing_servers\*m)+(newly_added_servers\*m)_ disks. New object upload requests automatically start using the least used cluster. This expansion strategy works endlessly, so you can perpetually expand your clusters as needed. When you restart, it is immediate and non-disruptive to the applications. Each group of servers in the command-line is called a pool. There are 2 server pools in this example. New objects are placed in server pools in proportion to the amount of free space in each pool. Within each pool, the location of the erasure-set of drives is determined based on a deterministic hashing algorithm.
> __NOTE:__ __Each pool you add must have the same erasure coding parity configuration as the original pool, so the same data redundancy SLA is maintained.__
> **NOTE:** **Each pool you add must have the same erasure coding parity configuration as the original pool, so the same data redundancy SLA is maintained.**
## 3. Test your setup
To test this setup, access the MinIO server via browser or [`mc`](https://docs.min.io/docs/minio-client-quickstart-guide).
## Explore Further
- [MinIO Erasure Code QuickStart Guide](https://docs.min.io/docs/minio-erasure-code-quickstart-guide)
- [Use `mc` with MinIO Server](https://docs.min.io/docs/minio-client-quickstart-guide)
- [Use `aws-cli` with MinIO Server](https://docs.min.io/docs/aws-cli-with-minio)