External usb 3.0 hdd, ntfs formated with compression enabled, connected directly to veeam v9 via blue usb 3.0 port with blue usb cable, bla bla. SAS tape connection to host. Job have enabled compression and encryption.
As you can see on picture, speed drop from 40 to 7mb/s. After some time speed go again to 40mb/s or more. Why is here this anomalies in transfer speed?
I have new job, new tape, same parameters and again drop in transfer speed. Very strange?!