CURRENT (FreeBSD 12.0-CURRENT #82 r315720: Wed Mar 22 18:49:28 CET 2017 amd64) is annoyingly slow! While scrubbing is working on my 12 GB ZFS volume, updating /usr/ports takes >25 min(!). That is an absolute record now. I do an almost daily update of world and ports tree and have periodic scrubbing 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 about 4 TB now) and this is now for ~ 2 years constant. I've experienced before that while scrubbing the ZFS volume, some operations, even the update of /usr/ports which resides on that ZFS RAIDZ volume, takes a bit longer than usual - but never that long like now! Another box is quite unusable while it is scrubbing and it has been usable times before. The change is dramatic ... Regards, Oliver
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