ScatterPlot worked in the way I wanted to ...
elapsed:day
5.3 ...
| ....
| .....
| ....
| .....
| .......
| ....... size:T
0.0 ........ 20.7
0.0.........------------------------------------
(This & following 2 lines I have added myself.)
X: amount of data transferred, TB;
Y: number of days elapsed.
Above is not very linear graph of data transferred via zfs send | ssh other-host zfs recv from one FreeBSD 12 host to another. After 5.3 days, 20.7 TB of data (total is 47.9 TB) had been transferred.
As of now, linear regression suggests ~10 more days to finish. Polynomial curve fit (of degree 3) — which had matched the plot more than linear regression — estimates ~30 days. Yikes!
