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Initializing Cloud Disks

Last updated: 2022-05-13 16:43:39

    Overview

    This document describes how to initialize a data disk in the Lighthouse console. After creating a cloud disk and attaching it to the Lighthouse instance as a data disk, you need to initialize the disk to use it.

    Prerequisites

    Attach a cloud disk to your Lighthouse instance. See Attaching a Cloud Disk.

    Considerations

    • Read FAQs about cloud disk usage before working with cloud disks.
    • Formatting a data disk will erase all data. Make sure that the disk does not contain data, or important data has been backed up.
    • To prevent service exceptions, ensure that the Lighthouse instance

    Directions

    Note

    This example uses a Lighthouse instance using Windows Server 2016 R2 operating system. Note that the steps may vary according to the operating system version.

    1. Log in to the Lighthouse instance. For more information, see Logging in to a Windows Instance via VNC.
    2. On the desktop, right-click in the lower-left corner and click Disk management in the pop-up menu.
      Open the Disk management window to view the data disk information.

      Note

      If the new disk is offline (as shown above), continue to Step 3 to make it online. If it’s already online, go to Step 4.

    3. Right-click in the Disk 1 area, and click Online.
    4. Disk 1 changes from Offline to Not Initialized. Right-click in the Disk 1 area and select Initialize Disk.
    5. In the Initialize Disk window, select the target disk and the disk partition format, and click OK. In this example, MBR (Master Boot Record) is used.
      Note

      If the disk partition format is changed after the disk is put into use, the original data on the disk will be erased. Please select an appropriate partition format based on actual needs.


    6. Right-click the free space of Disk 1, and select New Simple Volume.
    7. In the welcome page of New Simple Volume Wizard pop-up window, click Next.
    8. Specify the volume size as needed, which is the maximum value by default. Click Next.
    9. Assign a drive letter, and click Next.
    10. Select Format this volume with the following settings. Configure the parameters as needed, format the new partition, and click Next.
    11. Click Complete. Wait for a while for the system to complete the initialization. When the volume status becomes "Healthy", the disk initialization is successful.

      After the initialization is complete, enter the PC interface to view the new disk.

    Auto-mounting disks upon Linux instance start-up

    1. Confirm the mounting method and obtain the corresponding information.
      Based on business needs, you can use a cloud disk's soft link, file system's UUID (universally unique identifier), or device name to automatically mount a disk. The descriptions and information acquisition methods are as follows:

      Mounting method Pros and cons Information acquisition method
      Use the soft link of the cloud disk
      (recommended)
      Pros: The soft link of a cloud disk is fixed and unique. It does not change with operations such as mounting, unmounting, and formatting partitions.
      Cons: Only a cloud disk can use the soft link, which operates imperceptibly for the partition formatting operation.
      Run the following command to obtain the soft link of the cloud disk.
      sudo ls -l /dev/disk/by-id
      Use the UUID of the file system Auto-mounting configuration may fail due to changes in a file system's UUID.
      For example, reformatting a file system will change its UUID.
      Run the following command to obtain the UUID of the file system.
      sudo blkid /dev/vdb
      Use device name Auto-mounting configuration may fail due to changes in device name. Run the following command to obtain the device name.
      sudo fdisk -l
    2. Run the following command to back up the /etc/fstab file to the /home directory, for example:

      sudo cp -r /etc/fstab /home
      
    3. Run the following command to use VI editor to open the /etc/fstab file.

      sudo vi /etc/fstab
      
    4. Press i to enter edit mode.

    5. Move the cursor to the end of the file and press Enter, then add the following content.

      <Device information> <Mount point> <File system format> <File system installation option> <File system dump frequency> <File system check sequence at launch>
      
    • (Recommended) Assume that you need to automatically mount a cloud disk by using a soft link:
      /dev/disk/by-id/virtio-disk-xxxxx /data ext4 defaults 0 0
      

    For mounting the partition, add the following content:

    /dev/disk/by-id/virtio-disk-xxxxx-part1 /data/newpart ext4 defaults 0 2
    
    Note

    If you have multiple cloud disks, you can distinguish them by comparing the xxxxx in virtio-disk-xxxxx with the cloud disk ID lhdisk-xxxxxx in the console. The cloud disk ID in the console is shown below:

    - Take automatic mounting using the UUID of the disk partition as an example. Add the following content:
    UUID=d489ca1c-5057-4536-81cb-ceb2847f9954 /data  ext4 defaults     0   0
    

    For mounting the partition, add the following content:

    UUID=d489ca1c-5057-4536-81cb-ceb2847f9954 /data/newpart   ext4 defaults     0   2
    
    • Take automatic mounting using the device name as an example. Add the following content:
      /dev/vdb /data   ext4 defaults     0   0
      

    For mounting the partition, add the following content:

    /dev/vdb1 /data/newpart /data/newpart ext4 defaults 0 2
    
    1. Press Esc, enter :wq, and press Enter to save the configuration and exit the editor.
    2. Run the following command to check whether the /etc/fstab file has been written successfully.
      sudo mount -a 
      

    If the command runs successfully, the file has been written. The newly created file system will automatically mount when the operating system starts up.

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