I'm wracking my brain trying to figure out how to diagnose bottlenecks in my home network/backup system (my backup NAS had some issues, so I have to re-baseline my backups from 4 machines...).
Trying to copy files from one computer to another for backup, using both SMB and just rsync over SSH, I'm getting peak transfer rates of only like 6MByte/s. Average rate is more like 2MB/s.
This makes no sense to me, since I can download stuff "from the internet" at around 100MB/s, so I know it's not either my WiFi or my hard disk - they can handle much faster rates (at least on the destination computer). I even switched the laptop from WiFi (100MBit+) to its 1GBit hardline, but that doesn't seem to be helping much.
I am copying from an older laptop, so old it's battery is completely dead, so it's running only on wall power. Perhaps the old computer is throttling itself because of no battery? I really can't tell, but it's taking ages.
I'm almost ready to go buy a chassis to use the HDD in the old computer (it is an SSD, so shouldn't be the limit?) as an external drive. I don't really want to wait 5 hours to copy the remaining 37GB, which is what it would take at an average of 2MB/s...
I am thinking of using one of my routers to try and go hardline to hardline, but it doesn't feel like a bandwidth issue...