Public bug reported:

# Environment

Description:    Ubuntu 16.04.3 LTS
Release:        16.04

Linux 4.10.0-38-generic-tuxonice #42~ppa1-Ubuntu SMP Mon Oct 30 20:21:41
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

zfsutils-linux  0.6.5.6-0ubuntu18 amd64


# Current behaviour

`/usr/lib/zfs-linux/scrub` starts `zfs scrub` on all pools at the same
time. If pools are located on the same disk - scrub performance degrades
badly.

# Proposed behaviour

* simplest one - start scrub of one pool after another scrub is finished
* advanced - detect pools which are located on the same disk and start scrubs 
on them sequentially, if they are on different disks it is fine to run them in 
parallel

** Affects: zfs-linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1731735

Title:
  zfs scrub starts on all pools simultaneously

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