SMB odd behaviour

[pythonmegapixel]

I back up certain files on my personal PC to a crappy little D-Link NAS, which only supports SMB... these files are located in two different folders so I usually copy one folder over, then the other.

 

This time I accidentally started one before the other had finished, and discovered something really odd. For some reason, one of the copy operations maxes out the connection, while the other pretty much grinds to a halt. (It's no big deal, as the speed of the second one picks up as the first one finishes)

 

I expected the available bandwidth to be split between the two operations, so they would both transfer at roughly the same speed.

 

What's going on here?

[leadeater]

10 hours ago, pythonmegapixel said:

I expected the available bandwidth to be split between the two operations, so they would both transfer at roughly the same speed.

Balancing of load isn't really a fair share thing so you won't see a nice split between them. Further to that the disk performance in theses NAS's aren't that great so two copies at once will actually be slower than one at a time in terms of total time. Size of the file also affects the speed, lots of small files will have a much lower throughput than less larger files and this is on a per file thing which is why you'll see the current speed change quite a bit if you are copying a lot of various files.