```
mc admin tier add s3 source S3TIER --bucket s3bucket --prefix testprefix/ --use-aws-role
```

## Snapshots and Documentation

Snapshots of Guava built from the `master` branch are available through Maven
using version `HEAD-jre-SNAPSHOT`, or `HEAD-android-SNAPSHOT` for the Android
flavor.

-   Snapshot API Docs: [guava][guava-snapshot-api-docs]
-   Snapshot API Diffs: [guava][guava-snapshot-api-diffs]

## Learn about Guava

![put](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/replication/PUT_bucket_replication.png)

![head](https://raw.githubusercontent.com/minio/minio/master/docs/bucket/replication/HEAD_bucket_replication.png)

## Replica Modification sync

- [EK](#ek): An external secret key - either the SSE-C client-provided key or a secret key generated by the KMS.

#### Content Encryption

| :----------------------          | ------------------------------------------ | -------------------------------------  |
| `s3:ObjectCreated:Put`           | `s3:ObjectCreated:CompleteMultipartUpload` | `s3:ObjectAccessed:Head`               |
| `s3:ObjectCreated:Post`          | `s3:ObjectRemoved:Delete`                  | `s3:ObjectRemoved:DeleteMarkerCreated` |

#### Policy management permissions

- admin:CreatePolicy
- admin:DeletePolicy
- admin:GetPolicy
- admin:AttachUserOrGroupPolicy
- admin:ListUserPolicies

#### Heal management permissions

- admin:Heal

#### Service account management permissions

- admin:CreateServiceAccount
- admin:UpdateServiceAccount
- admin:RemoveServiceAccount
- admin:ListServiceAccounts

drive_workers  (int)       the number of workers per drive to heal a new disk replacement.
```

Example: The following settings will increase the heal operation speed by allowing healing operation to run without delay up to `100` concurrent requests, and the maximum delay between each heal operation is set to `300ms`.

```sh
~ mc admin config set alias/ heal max_sleep=300ms max_io=100
```

whereas in MinIO erasure code you can lose as many as half of drives and still the data remains safe. Further, MinIO's erasure code is at the object level and can heal one object at a time. For RAID, healing can be done only at the volume level which translates into high downtime. As MinIO encodes each object individually, it can heal objects incrementally. Storage servers once deployed should not require drive replacement or healing for the lifetime of the server. MinIO's erasure coded backend is...