What could be reasons for my rsync, which is syncing two remote servers through ssh, to slow down over time like this? It keeps happening. How to check what is the bottleneck?
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You aren’t giving us enough information to even speculate the answer. Are these Enterprise grade servers in a datacenter? Are these home made servers with consumer or low grade hardware you’re calling servers? Are they in the same datacenter or do they go out to the Internet? What exists between the hops on the network? Is the latency consistent? What is the quality of both sides of the connection? Fiber? Wi-Fi? Mobile? Satellite?
Does it drop too nothing or just settle into a constant slower speed? What have you tried to trouble shoot? Is it only rsync or do other tests between the hosts show the same behavior?
Give us more and you might get some help. If these hosts are Linux I would start with iperf to do a more scientific test. And report to us some more info.
It’s always the disk cache
At ~5GB per HOUR? I don’t think so
It’s the floppy disk cache
Humans slow down over time. Computers slow down over time.
Since we don’t know any more details, I put my $.02 on a cheap plastic router that wants to get rebooted sometimes.
