Date: Wed, 27 Sep 2017 13:17:24 +0200 From: Borja Marcos <borjam@sarenet.es> To: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Problem with the periodic scrub of ZFS pools Message-ID: <BDF5D737-DF1A-431E-8928-9603AB2AD283@sarenet.es>
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Hi, There=E2=80=99s a problem with the periodic script for ZFS pool = scrubbing (/etc/periodic/daily/800.scrub-zfs). It can be configured with an interval between scrubs = (daily_scrub_zfs_default_threshold=3D=E2=80=9C17=E2=80=9D) but the feature depends on making searches in the pool history. In a very = active ZFS pool (Mine has a lot of zfs dataset replications and there is a lot of zfs snapshot = creation/deletion/replication the scrub entries will disappear (the history has a finite length). In my case, for example, I configured 17 days between scrubs, I actually = get a weekly one. A better mechanism should be used to store the timestamp of the last = automated scrub. Custom attributes are a good candidate, but zpool doesn=E2=80=99t have that option. What = about adding it as a custom attribute to the root dataset of the pool? Ie, for a pool called =E2=80=9Ctank=E2=80=9D we could use =E2=80=9Czfs = set freebsd_period:last_scrub=3Dtimestamp=E2=80=9D or something slmilar. Ideas? Thanks! Borja.
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