Why do you have multiple pools on the same disks? That's very much not a
best practice or even typical ZFS installation.
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1731735
Title:
zfs scrub starts on all pools simultaneously
Status in zfs-linux package in Ubuntu:
Incomplete
Bug description:
# 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
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