ZFS auto scrub after upgrade to Xubuntu 19.10

[BertN45]

I have upgraded my dual boot laptop (Xubuntu 19.04 on ZFS) to 19.10, I only had a minor problem:

    The system on boot did start scrub of all datapools automatically, that was unexpected and it took a couple of minutes before I realized, why the system was that effing slow. There is a small chance that the monthly auto-scrub was due. If it is part of the upgrade do not do it without at least a notification and a confirmation of the user. Never start it during the boot process, please wait a few minutes. The same remarks are valid for the monthly default auto-scrub.
Even not Microsoft is allowed to monopolize my system for a long time without telling and without my permission, that is partly why I moved to Linux :) :)

I detected it relatively fast on my conky display, but else??
Of course I stopped the scrub of the two datapools on the same SSHD and restarted it one by one.
I'm more happy with the SSHD using ZFS and LZ4 compression.

[Richard Laager (rlaager)]

I’m not aware of anything new starting scrubs. Scrubs are throttled and usually the complaint is that they are throttled too much, not too little. Having two pools on the same disk is likely the issue. That should be avoided, with the exception of a small boot pool on the same disk as the root pool for root on ZFS setups. Is that your multiple pools situation, or are you doing something else?

[BertN45 (lammert-nijhof)]

I have two datapools one in the begin of the HDD for the Host OSes and Virtual Machines and one at the end for data, music, family videos and relatively large old archives. The throughput at the begin of the HDD is often twice the throughput at the end of the HDD, so I have a very good reason to put the Host OSes and Virtual Machines at the begin of a HDD.

[BertN45 (lammert-nijhof)]

Any reason to invalidate the bug report?