I backed up the disk files of the virtual machine to a non NFS environment through SFTP, and now I want to upload the files to CVM through SFTP. However, the upload speed of SFTP is too slow. A regular virtual machine disk file has at least 200GB, and uploading takes several hours. I tried using multithreading to split files and upload them in parallel, but merging these small files after uploading still requires the same upload time. Then I tried to create a 200GB empty file, but it still took a few hours for SFTP. May I ask if there is any way to solve this problem