>>>>> On Tue, 16 Feb 2016 18:59:10 -0500, Dan Langille said:
> 
> As a test, I scp'd over all the volumes for one job and timed it:
> 
> real    167m15.956s
> user    117m51.006s
> sys     23m56.653s
> 
> FWIW, these copies were done while a ZFS scrub was underway, so if anything, 
> the potential throughput is higher.
> 
> The job above, took nearly 11 hours.  Something is up.
> 
> I tried another test run, just now, but cancelled it after the first two 
> Volumes were read; it was going at about the same rate as the full job 
> mentioned above.
> 
> What might account for this vast difference?

You could try profiling it, e.g 
http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#DTrace

__Martin

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