How to mount a RAID hard drive in CentOS 7?

To mount a RAID hard drive on CentOS 7, you can follow these steps: 1. Make sure the RAID hard drive has been correctly configured and recognized. You can view the disk information in the system by running the command `fdisk -l`. RAID hard drives typically appear as `/dev/mdX`. 2. Create a directory for mounting the RAID hard drive. For example, you can use the command `mkdir /mnt/raid` to create a directory named `/mnt/raid`. 3. Use the `lsblk` command to view detailed information about the RAID device and find the one you want to mount. 4. Use the `mdadm` command to mount the RAID device to the specified directory. For example, if you want to mount the RAID device `/dev/md0` to the directory `/mnt/raid`, you can use the command `mount /dev/md0 /mnt/raid` to mount it. 5. Verify that the mounting was successful. You can use the `df -h` command to view the mounted file systems. 6. To automatically mount the RAID hard drive at system startup, you need to add the mounting information to the `/etc/fstab` file. Open the `/etc/fstab` file and add the following line to the end of the file:

  /dev/md0    /mnt/raid    ext4    defaults    0 0

Edit the device name and mount point path in the line above to fit your situation. Save and close the `/etc/fstab` file. You have now successfully mounted the RAID disk and it will automatically mount on system startup.