今天測了一下rsync
參數不管怎麼下
結果好像都差不多

time rsync -v -u --inplace /var/lib/vz/images/204/vm-204-disk.qcow2 /mnt/pve/nfs_49/dns_dos/
vm-204-disk.qcow2

sent 5921015635 bytes  received 31 bytes  43061932.12 bytes/sec
total size is 5920292864  speedup is 1.00

real    2m16.284s
user    0m47.094s
sys     0m22.522s

=======================================================================

 time rsync -avy /var/lib/vz/images/204/vm-204-disk.qcow2 /mnt/pve/nfs_49/dns_dos/
sending incremental file list
vm-204-disk.qcow2

sent 5921015639 bytes  received 31 bytes  37593750.29 bytes/sec
total size is 5920292864  speedup is 1.00

real    2m37.259s
user    0m49.275s
sys     0m24.471s

=======================================================================

time rsync -av /var/lib/vz/images/204/vm-204-disk.qcow2 /mnt/pve/nfs_49/dns_dos/
sending incremental file list
vm-204-disk.qcow2

sent 5921015639 bytes  received 31 bytes  41844633.71 bytes/sec
total size is 5920292864  speedup is 1.00

real    2m20.808s
user    0m45.490s
sys     0m21.791s