> This is a slow operation which can only be done about 180-250 times per second
> for very random I/Os (may be more with HDD/Controller caching, queuing and
> faster spindles).
> I'm afraid that seeking to very dispersed metadata blocks, such as traversing
> the
> tree during a scrub on a fragmented drive, may qualify as a very random I/O.
And that's the thing- I would understand if my scrub was slow because the disks
were just being hammered by IOPS but- all joking aside- my pool is almost
entirely idle according to an iostat -Xn
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