Migrate NAS data to on-premises storage

Select a migration method

Select a method based on your scenario:

Use an SFTP client

Procedure

1. Install an SFTP client on your local operating system.

   Various SFTP clients are available. This topic uses FileZilla as an example. Download and install an SFTP client that is compatible with your local operating system.

2. Connect the SFTP client to the transit node ECS instance.

   1. Open the FileZilla client, configure the following parameters, and then click Quickconnect.

      After the connection is established, the left pane displays your local file system, and the right pane displays the file system of the ECS instance.

      Parameter	Description
      Host	The public IP address of the transit node ECS instance. For example, 192.0.2.1.
      Username	The username for the transit node ECS instance. This user must have read and write permissions on the File Storage NAS directory. For example, root. Note The default username for a Linux ECS instance is root or ecs-user. The default username for a Windows ECS instance is administrator.
      Password	The logon password for the transit node ECS instance. For example, the root password. Note If you forget the password for the transit node ECS instance, you can reset it. For more information, see Reset the logon password of an instance.
      Port	The SFTP port number. The default is 22.

   2. In the right pane, set the path in Remote site to the mount path of the File Storage NAS file system, such as /mnt, and press Enter to view the list of files on the file system.

      

3. Download data.

   Drag and drop files or directories from the right pane to the left pane.

Use rsync

Benefits

• Preserves file metadata, including ownership and permissions.

• Supports incremental synchronization.

• Supports crontab scheduling on Linux or macOS for automated backups.

Procedure

1. Install rsync.

   Linux

   Operating system	Command
   CentOS	Install rsync with yum: sudo yum install rsync
   Redhat
   Ubuntu	Install rsync with apt: sudo apt-get install rsync
   Debian

   Note

   For other Linux distributions, use the corresponding package manager.

   macOS

   Install Homebrew, then run:

   brew install rsync

   Windows

   • Install the Cygwin environment and search for and select rsync during setup. Alternatively, download, compile, and install rsync manually.

     Note

     Enable TCP port 22 (SSH) in the security group of the associated VPC.

2. Download data.

   Run the following command to download NAS data to a local directory:

   rsync -avP root@192.0.2.0:/mnt/DirToSync/ DirToSync/

   Parameter	Description
   192.0.2.0	The public IP address of the Linux or Windows ECS instance where the NAS file system is mounted.
   /mnt/DirToSync	The directory to export from NAS.
   DirToSync	The local directory.

   Note

   Paths in the rsync command must end with a forward slash (/). Otherwise, the directory structure will not match after synchronization.

Use Robocopy

Benefits

Robocopy is a Windows directory copy command that creates mirror copies with identical file structures without duplicating unchanged files, and preserves attributes such as dates and timestamps.

For large-scale migration, install Python on a Windows ECS instance and use the migration.py script. How do I accelerate data migration to an SMB file system?

Procedure

1. Log on to the Alibaba Cloud ECS instance that you use for data migration.

2. Migrate the data.

   Run the following command to migrate data from the source file system (drive Z) to the destination file system (drive Y).

   robocopy Z:\ Y:\ /e /w:5 /z /mt:32

   Note

   This command migrates only the data within the specified directory, not the directory itself.

   The following table describes the key parameters. Replace them based on your actual requirements.

   Parameter	Description
   /mt	Specifies the number of concurrent threads. The default value is 8. The value must be an integer from 1 to 128. This example uses 32 threads for multithreaded copying.
   /w	Sets the interval in seconds between retries after an error.
   /z	Copies files in restartable mode.
   /e	Copies subdirectories, including empty ones.
   /copyall	Copies all file information, including: Data Attributes Timestamps Access control lists (ACLs) Owner information Auditing information

   Note

   To accelerate the migration of a massive amount of data, such as hundreds of millions of small files that exceed 10 TB, you can install the latest version of Python on a Windows ECS instance to perform the migration. For more information, see Accelerate data migration to an SMB file system.

3. Check the migration result.

   After the migration is complete, run the following Robocopy command to verify that the destination file system is consistent with the source file system.

   ROBOCOPY Z:\ Y:\ /e /l /ns /njs /njh /ndl /fp /log:reconcile.txt

   The following table describes the key parameters. Replace them based on your actual requirements.

   Parameter	Description
   /e	Lists directories, including empty ones.
   /l	Logs differences without modifying or copying files.
   /fp	Includes the full path of files in the log. This is necessary only if /ndl is omitted.
   /ns	Excludes file sizes from the log.
   /ndl	Excludes directories from the log.
   /njs	Excludes the job summary.
   /njh	Excludes the job header.
   /log:reconcile.txt	Writes the migration result to the reconcile.txt log file. This overwrites the log file if it exists.

Use IIS FTP

Procedure

For more information, see Configure the Windows IIS web service.

Transfer via OSS

Sync data to OSS using ossutil or Data Transport, then download from OSS to local storage.

1. Migrate data to OSS.

   • Use ossutil to migrate data to OSS. For more information, see Migrate data by using ossutil.

   • Use Data Transport to migrate NAS data to OSS. Migrate data by using Data Transport.

2. Download the data from OSS to local files. For more information, see Simple download.