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Starting the Smart Prefetch Engine

Ensure that the file system format of the bcache drive is ext4. Other file system formats are not supported.

Run the lsblk -fs command to check whether the file system format of the bcache drive is ext4.

Start the acache_client service.
```
sudo systemctl start acache_client
```
Check whether the acache_client has been started successfully.
```
sudo systemctl status acache_client
```
If the command output contains active (running), the acache_client has been started successfully.
When the acache_client service is being started, if an error message is displayed stating "Warning: acache_client.service changed on disk. Run 'systemctl daemon-reload' to reload units.", resolve this problem by performing the following operations:
1. Reload the service configuration file.
  systemctl daemon-reload
2. Start the acache_client service.
  systemctl start acache_client

Parent topic: Enabling the Big Data Smart Prefetch