I cannot upload files on my WordPress CMS. The system prompts that "failed to write file to disk." when I try to upload a file at Media. Then I checked my google cloud instance and found that my /dev/sdb that mounted on / has been fully occupied.
Then I tried to resize it following the instructions from google cloud documentation but failed. It seems that I cannot resize it to greater than 2.0T.
The following is what echoes when I type the lsblk command.
This instance wasn't created by me and I am totally at a loss. The instance's operating system is Debian 9, and the fdisk command doesn't work on it.
Any ideas or suggestions would be appreciated.