# Viewing replication details
Viewing replication details

You can monitor the time when the last successful sync was completed in a replication configuration. Any changes to data on the source file system that occurred before this time have been successfully replicated to the destination file system. Any changes that occurred after this time might not be fully replicated. To monitor when the last replication successfully finished, you can use the Amazon EFS console, AWS CLI, API, or Amazon CloudWatch.
+ **In the EFS console** – The **Last synced** property in the **File system details** > **Replication** section shows the time when the last successful sync between the source and destination was completed.
+ **In the AWS CLI or API** – The `LastReplicatedTimestamp` property in the `Destination` object shows the time that the last successful sync was completed. To access this property, use the `describe-replication-configurations` CLI command. [DescribeReplicationConfigurations](API_DescribeReplicationConfigurations.md) is the equivalent API operation.
+ **In CloudWatch** – The `TimeSinceLastSync` CloudWatch metric for Amazon EFS shows the time that has elapsed since the last successful sync was completed. For more information, see [CloudWatch metrics for Amazon EFS](efs-metrics.md).

A replication configuration can have one of the status values described in the following table.


| Replication state  | Description | 
| --- | --- | 
|  `ENABLED`  |  The replication configuration is in a healthy state and available for use.  | 
|  `ENABLING`  |  Amazon EFS is in the process of creating the replication configuration.  | 
|  `DELETING`  |  Amazon EFS is deleting the replication configuration in response to a user-initiated delete request.  | 
|  `PAUSING`  | Amazon EFS is in the process of pausing replication. | 
|  `PAUSED`  | Replication is paused due to a problem with the configuration. Additional information about the problem is provided. Some problems that cause the replication to be paused include:[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/efs/latest/ug/monitoring-replication-status.html) | 
|  `ERROR`  |  The replication configuration is in a failed state and is unrecoverable. You must delete the replication configuration and create a new one.  Additional information about the problem is provided. For cross-account or cross-Region replication, the error may be caused because the replication configuration was deleted from the other AWS account or AWS Region.   | 

## Using the console


1. Open the Amazon Elastic File System console at [https://console.aws.amazon.com/efs/](https://console.aws.amazon.com/efs/).

1. In the left navigation pane, choose **File systems**.

1. Choose a file system from the list.

1. Choose the **Replication** tab to display the **Replication** section.

   In the **Replication** section, you can see the following information for the replication configuration:
   + **Replication state** may be **Enabling**, **Enabled**, **Deleting**, **Pausing**, **Paused**, or **Error**. Amazon EFS displays details about the cause for the **Paused** or **Error** state.
   + **Replication direction** shows the direction in which data is being replicated. The first file system listed is the source, and its data is being replicated *to* the second file system listed, which is the destination.
   + **Last synced** shows when the last successful sync occurred on the destination file system. Any changes to data on the source file system that occurred before this time were successfully replicated to the destination file system. Any changes that occurred after this time might not be fully replicated.
   + **Replication file systems** lists each file system in the replication configuration by its file system ID, the role it has in the replication configuration (either source or destination), the AWS Region in which it's located, and its **Permission**. A source file system has a permission of **Writable**, and a destination file system has a permission of **Read-only**.

## Using the AWS CLI


To view a replication configuration, use the `describe-replication-configurations` command. You can view the replication configuration for either a specific file system, or all replication configurations for a particular AWS account in an AWS Region. The equivalent API command is [DescribeReplicationConfigurations](API_DescribeReplicationConfigurations.md).

If the status of the replication configuration is `PAUSED` or `ERROR`, information about the cause of the issue and how to fix it is returned in the `StatusMessage` parameter. 

**Example : View the replication configuration for a specific file system**  
The following example describes the replication configuration for the file system `fs-0123456789abcdef1`.  

```
aws efs describe-replication-configurations --file-system-id fs-0123456789abcdef1
```
The AWS CLI responds as follows.  

```
{
    "Replications": [
        {
            "SourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:111122223333:file-system/fs-abcdef0123456789a", 
            "CreationTime": 1641491892.0,
            "SourceFileSystemRegion": "eu-west-1", 
            "OriginalSourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:111122223333:file-system/fs-abcdef0123456789a", 
            "SourceFileSystemId": "fs-abcdef0123456789a", 
            "Destinations": [
                {
                    "Status": "ENABLED", 
                    "FileSystemId": "fs-0123456789abcdef1", 
                    "Region": "us-east-1"
                }
            ]
        }
    ]
}
```

**Example : View the replication configuration for all the replication configurations in an account**  
The following example describes the replication configuration for all the replication configurations for an account in an AWS Region the file system.   

```
        aws efs describe-replication-configurations
```
The AWS CLI responds as follows.  

```
     {
    "Replications": [
        {
            "SourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:555555555555:file-system/fs-0123456789abcdef1", 
            "CreationTime": 1641491892.0, 
            "SourceFileSystemRegion": "eu-west-1", 
            "OriginalSourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:555555555555:file-system/fs-0123456789abcdef1", 
            "SourceFileSystemId": "fs-0123456789abcdef1", 
            "Destinations": [
                {
                    "Status": "ENABLED", 
                    "FileSystemId": "fs-abcdef0123456789a", 
                    "Region": "us-east-1",
                    "LastReplicatedTimestamp": 1641491802.375
                }
            ]
        }, 
        {
            "SourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:555555555555:file-system/fs-021345abcdef6789a", 
            "CreationTime": 1641491822.0, 
            "SourceFileSystemRegion": "eu-west-1", 
            "OriginalSourceFileSystemArn": "arn:aws:elasticfilesystem:eu-west-1:555555555555:file-system/fs-021345abcdef6789a", 
            "SourceFileSystemId": "fs-021345abcdef6789a", 
            "Destinations": [
                {
                    "Status": "ENABLED", 
                    "FileSystemId": "fs-012abc3456789def1", 
                    "Region": "us-east-1", 
                    "LastReplicatedTimestamp": 1641491823.575
                }
            ]
        }
    ]
}
```