From owner-freebsd-current@freebsd.org  Wed Mar 22 20:11:01 2017
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Subject: Re: CURRENT: slow like crap! ZFS scrubbing and ports update > 25 min
From: Michael Gmelin <freebsd@grem.de>
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Date: Wed, 22 Mar 2017 21:10:51 +0100
Cc: FreeBSD CURRENT <freebsd-current@freebsd.org>
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To: "O. Hartmann" <ohartmann@walstatt.org>
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> On 22 Mar 2017, at 21:02, O. Hartmann <ohartmann@walstatt.org> wrote:
>=20
> CURRENT (FreeBSD 12.0-CURRENT #82 r315720: Wed Mar 22 18:49:28 CET 2017 am=
d64) is
> annoyingly slow! While scrubbing is working on my 12 GB ZFS volume, updati=
ng /usr/ports
> takes >25 min(!). That is an absolute record now.
>=20
> I do an almost  daily update of world and ports tree and have periodic scr=
ubbing ZFS
> volumes every 35 days, as it is defined in /etc/defaults. Prts tree hasn't=
 grown much,
> the content of the ZFS volume hasn't changed much (~ 100 GB, its fill is a=
bout 4 TB now)
> and this is now for ~ 2 years constant.=20
>=20
> I've experienced before that while scrubbing the ZFS volume, some operatio=
ns, even the
> update of /usr/ports which resides on that ZFS RAIDZ volume, takes a bit l=
onger than
> usual - but never that long like now!
>=20
> Another box is quite unusable while it is scrubbing and it has been usable=
 times before.
> The change is dramatic ...
>=20

What do "zpool list", "gstat" and "zpool status" show?