File Storage NAS:Manage snapshots

Usage notes

• You can manually create a maximum of 128 snapshots for each file system. A maximum of 128 auto snapshots can be created for each file system.

• If a snapshot is being created for a file system, you cannot create another snapshot for the file system.

• If a file system expires when a snapshot is being created for the file system, the file system is released and the snapshot is deleted.

• When a snapshot is being created for a file system, the performance of the file system may be slightly compromised and the input/output operations per second (IOPS) may be temporarily degraded. We recommend that you do not create snapshots during peak hours.

• A snapshot is a backup of a file system at a specific point in time. When you create a snapshot for a file system, incremental data of the file system is not synchronized to the snapshot.

Manually create a snapshot

1. Log on to the NAS console.

2. In the left-side navigation pane, choose Data Service > Snapshot.

3. In the top navigation bar, select a region.

4. On the Snapshot tab, click Manually Create Snapshot.

5. In the Manually Create Snapshot dialog box, configure the parameters. The following table describes the parameters.

   Parameter	Description
   File System	Select the ID of the advanced Extreme NAS file system for which you want to create a snapshot.
   Retention Period	Select a retention period based on your business requirements. Custom Duration: Specify the period for which the snapshot is retained. Unit: days. Valid values: 1 to 65536. Permanently retained until the number of snapshots reaches the upper limit: The snapshot that you create is permanently retained. If the number of manually created snapshots exceeds 128, NAS deletes the earliest snapshot.

6. Click OK.

Create an automatic snapshot policy

1. Log on to the NAS console.

2. In the left-side navigation pane, choose Data Service > Snapshot.

3. In the top navigation bar, select a region.

4. Create an automatic snapshot policy.

   1. On the Snapshot page, click the Automatic Snapshot Policy tab.

   2. On the Automatic Snapshot Policy tab, click Create Automatic Snapshot Policy.

   3. In the Create Automatic Snapshot Policy dialog box, configure the parameters. The following table describes the parameters.

      Parameter	Description
      Created At	The hours of the day at which auto snapshots are created. You can select one or more hours from 00:00 to 23:00. Note When snapshots are being created for a file system, the IOPS of the file system is temporarily degraded. We recommend that you set off-peak hours to create snapshots.
      Recurring Date	The days of the week on which auto snapshots are created. You can select one or more days from Monday to Sunday.
      Retention Period	The retention period of auto snapshots. The default retention period is 30 days. The following options are available: Custom Duration: Specify the period for which the snapshot is retained. Unit: days. Valid values: 1 to 65536. Permanently retained until the number of snapshots reaches the upper limit: Auto snapshots are permanently retained. If the number of auto snapshots reaches 128, NAS deletes the earliest snapshot.

   4. Click OK.

5. Apply the automatic snapshot policy.

   1. Find the automatic snapshot policy that you want to apply and click Apply to File Systems in the Actions column.

   2. In the File System ID section of the Apply to File Systems dialog box, select one or more file systems and click the > icon to move the file systems to the Apply to File Systems section.

   3. Click OK.

      After you apply an automatic snapshot policy to a file system, NAS automatically creates snapshots for the file system based on the policy.

Use a snapshot to create a file system

1. Install NAS SDK for Python.

   pip install aliyun-python-sdk-core
   pip install aliyun-python-sdk-nas
   pip install alibabacloud_credentials 

2. Customize the code that is provided in NAS SDK for Python and run the code to create a file system.

   Note

   Before you call the operation, you must configure environment variables and obtain access credentials from the environment variables. For more information about how to configure environment variables, see Configure environment variables in Linux, macOS, and Windows.

   #!/usr/bin/env python3
   import json
   
   from aliyunsdkcore.client import AcsClient
   from alibabacloud_credentials.client import Client
   from aliyunsdknas.request.v20170626.CreateFileSystemRequest import CreateFileSystemRequest
   
   cred = Client() # Use the default credentials to initialize the SDK Credentials client. 
   
   
   def create_file_system():
       # The AccessKey pair of an Alibaba Cloud account has permissions on all API operations. Using these credentials to perform operations is a high-risk operation. We recommend that you use a Resource Access Management (RAM) user to call API operations or perform routine O&M. To create a RAM user, log on to the RAM console.
       # In this example, the AccessKey ID and AccessKey secret are saved in the environment variables. You can also save the AccessKey pair in the configuration file based on your business requirements.
       # To prevent password leaks, we recommend that you do not save your AccessKey ID and AccessKey secret to your code file.
       client = AcsClient(cred.get_access_key_id(), cred.get_access_key_secret(), 'cn-hangzhou')
       request = CreateFileSystemRequest()
       request.set_accept_format('json')
       # Pay-as-you-go
       request.set_ChargeType("PayAsYouGo")
       request.set_StorageType("advance")
       request.set_ProtocolType("NFS")
       request.set_FileSystemType("extreme")
       request.set_Capacity("100")
       request.set_ZoneId("cn-hangzhou-g")
       request.set_SnapshotId("s-extreme-xxxxxxxxxx")
   
       response = client.do_action_with_exception(request)
       res = json.loads(response)
       print(res)
   
   
   if __name__ == "__main__":
       create_file_system()

   The following table describes the parameters. For more information, see CreateFileSystem.

   Parameter	Description
   StorageType	The storage class of the file system. Valid value: advance, which indicates that the storage class is advanced. For example, you have created a snapshot named B_Snapshot for an advanced Extreme NAS file system. When you create another file system based on B_Snapshot, you must set the StorageType parameter to advance.
   ProtocolType	The protocol of the file system. Extreme NAS file systems support only NFSv3.
   Capacity	The storage capacity of the Extreme NAS file system that you want to create. The value of this parameter must be the same as the storage capacity of the file system for which the snapshot is created. For example, you have created a snapshot named A_Snapshot for an advanced Extreme NAS file system whose storage capacity is 100 GiB. When you create another file system based on A_Snapshot, you must set the Capacity parameter to 100.
   ZoneId	The zone in the region to which the snapshot belongs. For example, you can specify cn-hangzhou-g. You can call the DescribeZones operation to query all available zones.
   SnapshotId	The snapshot ID.

Related operations

References

You can call the ResetFileSystem operation to roll back a file system to the file system at a specific point in time. For more information, see ResetFileSystem.